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C4 corvette stalls at idle. i hope this does it. Sometimes it will restart and run idle very rough but stepping on the gas does nothing. I then washed it just like I always have (careful not to get the opti wet). Oct 25, 2024 · C4 Tech/Performance - 1984 C4 stalls when coming to a stop - Hello! I recently purchased my first vette, a 1984 with 18,700 miles and have put about 200 miles on it since purchase and getting it serviced. Corvetteforum. Things a1996 LT-4 manual transmission starts and idles very rough for a few seconds then smooths out and increases RPMs for a few more seconds total run time about 10 seconds then shuts off. As a preface, my idle speed used to be a steady 900 in P and 600 in D. 5 years. May 10, 2011 · Hi, Im new to the Forum, this is my second post :seeya: I recently bought an 86E TPI and its got an interesting set of issues, especially with idle. The codes showed up as: 34 MAF / MAP sensor too low. A few years ago I had issues with hesitation and stumbling on acceleration with no engine codes (on the advice of a forum member I replaced oxygen sensors and the problem was fixed). 8K views 7 replies 6 participants last post by autowiz Jul 12, 2015 Apr 12, 2011 · I've always idled about 800 rpm. Jul 23, 2023 · Idle Air Control Valve (IAC) – The idle does hunt a little bit on first start, so I’ve wondered if this could be something. Does it take several tries on start up to get it idling because it stall out on more than one attempt? Cut out when giving it gas at idle? When was the last tune-up? Nov 3, 2013 · C4 General Discussion - 1989 C4 Corvette engine stalls HELP! - Need advice. Then when I'd try to accelerate it'd stumble pretty bad but do just fine if I accelerated real slow C4 Corvette dies while idling My 1986 Corvette has been sitting for about 18 months. Did this just suddenly start or has it gradually gotten worse over time? The initial idle is way too high. what may cause these issues? Jul 12, 2012 · C4 Tech/Performance - Low idle when AC turned on - I have an 88 Corvette and it runs ok except when I turn on the AC. Service engine light comes on. It only happens once the car is warmed up. C4 Idle Problem I posted this on a couple forums and I am just trying to cover my bases to see if anyone has run into this themselves and found a solution. I suspect an intake leak but is there anything I can Aug 14, 2002 · C4 Tech/Performance - 1985 coupe stalls out occasionally - We still have this problem where the car will randomly stall out on us- it's been to the shop twice and the problem hasn't been corrected. Feb 19, 2019 · about once or twice a month I get a question that,s basically asking some version, of " WHY is my C4 corvette is running like crap, Failing too start or stalling" Ive often wondered ,how many of you gentlemen refer to these threads when , your faced with some problem or trouble code Oct 23, 2022 · C4 Tech/Performance - 1993 Corvette stalling issue - update - Good afternoon everyone. However, when driving the idle is stable and perfect. Sep 19, 2025 · C4 Tech/Performance - Occasional unstable idle and stalling, 2-3 times then fine - 93 base convertible with 43k miles. Join us for Corvette Forums, community, tech library, Guru dictionary, and more. I have an update on my 93 Corvette that stalls randomly and sometimes starts right away and sometimes it takes a few minutes to start. In this article, we’ll look at some of the most common causes of a rough idle in the Corvette and how to fix the problem. Then start it, it runs rough to the point that it wants to stall. Nov 4, 2016 · C4 Tech/Performance - C4 starts but immediatly stalls - Can anyone give me the tech manual instructions for initial engine set up after a tear down? I have fooled around with the IAC, TPS, and idle set screw and now my engine starts but immediately stops. Temperature at time between 70 and 125 degree. Mar 2, 2011 · I've been having problems with my 92 Convertible LT1. I ended up putting it back together and then taking apart again to the water pump immediately. It has some issues with stalling. Jul 15, 2023 · C4 Tech/Performance - Stalling at idle - Hi everyone. Its got a freshly rebuilt motor and trans, AIR pump delete, EGR is May 11, 2017 · C4 Tech/Performance - Engine stalling - I took out my 94 C4 this morning. However, there?s one issue I haven?t been able to resolve since buying it. Got the vehicle up and running about 5 months ago after sitting for a while (see my other thread for more details). After it stalls it will restart and not stall again entill next day when it goes thru the same cycle. My C4 is stock and has the smog pump removed. I have an 85, which I bought a month ago. Recently, I noticed it is hard to start. I went to start it the other day and it would only start if I stepped on the throttle, but then it would die as soon as I took my foot off the throttle. Aug 4, 2016 · C4 Tech/Performance - 1994 LT1 Random Engine Stalls usually when coming to Idle - 1994 Corvette Automatic with standard LTI engine with 89K miles This spring, the engine stalled a couple of times as I was coming to a stop. Does this have something to do with the smog control? I know I've got to get a new computer chip for the car, but I've gotta get it to the tuner without stalling 50 times! Any ideas? Cbarison Jun 3, 2021 · While driving your Corvette on the roads it is likely in "Closed Loop". Jul 2, 2005 · ive got an 1985 corvette just had the engine rebuilt. Does this sound like the IAC motor is not working correctly? Aug 19, 2016 · CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 General Discussion Rough idle/stall Notices C4 General Discussion General C4 Corvette Discussion not covered in Tech Jul 16, 2017 · C4 Tech/Performance - 1985 Idle surging after warmup - I have read through several threads and can't seem to find a answer for a familiar problem. If I drive the car, the RPM's will drop and the car will die. This progressed to it just stalling and me having to restart the engine. It feels like it's missing at Feb 16, 2009 · C4 Tech/Performance - '91 L98 Hard Start, Stalling, and Running Rich - Hi all, I've posted about my issues as I've brought them up in different threads. For details see Post 40 on page 2 of this thread I was driving my '92 LT1 six speed yesterday when this happened for the first time. i set it at factory specs but when it goes in closed loop RPMs go up and down from 600 to 1000 RPMs. The car runs great but when at temp and she is warmed up, under load at a stop light sometimes it stalls. 43K original miles. It will be idling fine for about 30 seconds and then it will drop down to about 300-400 rpm. After it cools off, it starts and runs great. Jul 6, 2019 · C4 Tech/Performance - 96 corvette stalls when hot - 96 when hot surges and stalls at 2000 rpm. Spent my younger years playing with 1st and 2nd generation Camaros. Sometimes stalls, sometimes idle drops to less than 300-400 before recovering. In drive it idles around 550. Knowing the sequence will help you troubleshoot no start conditions. Feb 24, 2012 · C4 General Discussion - [My '94 is sick - HELP!]rough idle/stall - warm engine - Tried searching but the results were nebulous at best The car - 1994, auto, 145K miles on the clock, daily driven, occasional circuit and drag track days. Mar 13, 2012 · I have an 86 C4 with an idle and stall issue I just can't figure out. Featuring forums, VIN decoder, club directory, events calendar, research tools, and parts shopping. If you catch it before it stalls it will idle. When I first start my '87 it sits around 1,000 until it comes up to temp and then goes down to 600-700 when in park. If the car is in neutral, it has no issues going from idle to 4-5000 RPM. Aug 24, 2013 · C4 General Discussion - 84 Engine Stalling - As most of you guys know, I rebuilt the engine on my 84 (auto trans equipped) and have been getting everything dialed in with the car over the last couple days. If i Nov 3, 2011 · C4 General Discussion - Rough Idle when engine is hot, SOLVED - So I was working on the vette again cause the rough idle when hot came back. It is finally warm and I got it all put back together, however, I now have new issues. May 26, 2021 · C4 Tech/Performance - 1985 corvette Rough idle and stalls at idle - Title sums it up kinda rough idle and stalls when you stop at a red light for instance. If I disconnect the EST the timing drops to 6 ATC. The most common cause of a rough idle is misfiring. My car would not idle, it would just immediately stall out upon cranking. While I was cleaning May 5, 2010 · C4 General Discussion - Won't idle below 900 rpm - I am helping a kid from work try to straighten out his 1985 Corvette. Occasionally my car will repeatedly stall when I first start it. Sep 9, 2015 · Corvette resources for all generations, model years 1953-present. At the very least, you can ohm check it, if you have a spare, drop it in and take it for a ride Oct 30, 2023 · C4 Tech/Performance - 1989 L98 Stalling, Intermittent Rough Idle - Hello everyone, First post. Last night my car started idling funny, like it almost wanted to die but didn't. I got it from an estate sale super cheap due to a rough idle and stalling issue. See this thread from the C4 Sticky for further on setting minimum idle. May 29, 2018 · C4 Tech/Performance - 1993 LT1 low idle and stalls on cold start - Brothers, you helped me last time, I need some input once again. Things a Apr 26, 2023 · C4 Tech/Performance - Wont idle/ Stalls at traffic lights/ lacking power - So I had some engine work done on my 86. May 9, 2011 · Idle drops a bit for just a second after about 1 minute or 2 of idling, and it still sounds like a slight misfire while driving around town or on the highway every so often, but its way better and it pulls much harder on acceleration. My thoughts would be that the timing might be out, or the idle air control motor might be messed up, or you need to adjust your idle. Once I get to about 195 deg F, the car simply will not idle smoothly, eventually stalls out particularly when I give it throttle leaving Aug 14, 2004 · C4 Tech/Performance - Car stalling at idle - My car's been running great all summer, but I recently returned from a two week vacation and now I can't even start it. So finally the roads. The previous owner said that it was caused by the IAC but I wanted to know if anyone C3 Tech/Performance - 1975 Corvette bogs and stalls when accelerating from idle when cold - Hey everyone, I?m trying to sort a drivability issue on my 1975 Corvette (base 350, Quadrajet). The next day this is how it was running. I have a 93 LT-1. ive been noticing that when my engine gets up to running tempruture and i put it in park the idle go up and down almost to a stall but o nly when hot any help thank john Feb 11, 2018 · C4 Tech/Performance - 1985 C4 stalls after increasing RPM from Idle - FIXED 2/27/2018 My 1985 Stalls after I increase RPMs and will start right back up. Sometimes when idle drops down it goes to 400 rpm and engine almost stallI've cecked for vacuum leaks and intake manifold gasket leaks. Once set, recheck your TPS. she starts right up without a problem. I think that is wrong. edit: 1996 LT4 So this recently started after I left the car idling after some driving. I had to head gaskets recently changed and I truly believe that Aug 10, 2024 · C4 General Discussion - 1994 Corvette Surging and Stalling - Good afternoon, 1994 base model automatic. Id like some opinions and input to start planning a repair route please. Mar 19, 2011 · C4 Tech/Performance - Wont Idle - 1987 Corvette with 147k Hey guys, I have been working on replacing my intake manifold gasket for the last few months. Mods included, 10. Replaced cam with a more aggressive Lunati Voodoo cam, Replaced upper intake plenum with a ported and polished unit, replaced lower intake with a ported factory replacement unit, replaced timing chain, Aug 30, 2019 · If you own a Chevy Corvette and it’s idling rough, you may be feeling frustrated. It wasn't that bad at first but now it's getting worse. It's been sitting about 1. The first visit resulted in a complete tune up (new plugs, plug wires, they checked the air and fuel filters, PCV valve, Apr 19, 2006 · C4 Tech/Performance - Car stalls when @ idle - Need help troubleshooting my problem I don't know where to start on this one. It also jumps a Aug 23, 2004 · C4 Tech/Performance - Help! 86 L98 stalls at idle with a code 34 - I am a tad out of my league when it comes to MAFwhich the manual says is what a code 34 means. - Hello everybody I am new here. Sep 3, 2015 · Hi All,I need some help! I've done a lot of work on my '87 C4, new cam, ported out heads and intake manifold and plenum. Or if you - Chevrolet 1989 Corvette question Feb 6, 2009 · Turned car on, shot timing, adjusted to 6 degrees, rechecked TPS at . It stalls hot or cold when slowing at an intersection or light. - 89 Vette. A couple times when it has done this it stalled. Is the Jul 2, 2012 · C4 Tech/Performance - 85 L98 stalls at idle, need help - Background on Vette: 1985 Z51, auto, stock, I bought it from the original owner about 2 years ago. Mar 3, 2018 · C4 Tech/Performance - 1985 C4 stalls after increasing RPM from Idle - FIXED 2/27/2018 My 1985 Stalls after I increase RPMs and will start right back up. The car idles between 700 - 800 RPM with the air off, but when the air is turned on it drops between 500 - 600 RPM but when it hits 400 it stalls. Apr 1, 2014 · C4 Tech/Performance - 84 Crossfire Engine Stall - Why does it seem like every time I do something nice for my 84 it responds by kicking me in the a**? I just finished replacing all of the carpet, which was a way bigger and time consuming job that I had estimated, but was well worth the effort. Sep 10, 2014 · C4 Tech/Performance - low idle and stall when decelerating into a stop - 1985 L98 occasionally stalls when going into a stop without warning only has 100k on it IAC motor is new, MAF plug and electrical plugs are clean throttle body and valve are spotless it was fine for a week after cleaning MAF now I'm just clueless Aug 10, 2004 · C4 Tech/Performance - Car occasionally stalls at idle - I have an 86 and on occasion when I start the car with air on, the car shows an idle of 400 and then stalls. Jul 2, 2006 · CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 Tech/Performance Rough idle and stalls. Stalls can happen at any time, and it can be incredibly jarring when it does happen. Sep 10, 2019 · One of the most common issues your Chevy Corvette is likely to develop is a stalling problem. Can this be done on Dec 22, 2010 · Hey everyone, sorry for the length I just want to be thorough. 54 Fuel pump voltage low. Apr 30, 2017 · C4 Tech/Performance - stalling under acceleration - i have an 85 vette when cold idles high and stalls when trying to accelerate. I recently bought an 84, with an automatic. It's an intermittant problem. Oct 6, 2022 · I have an 87 auto corvette and I really need help chasing down a strange idle issue. I shut it off for around 20 minutes or so. guru is your independent Corvette resource. Engine was rebuilt 60km's ago. The IAC are working with the throttle so I assume the ECM Oct 14, 2017 · Hello all! I just purchased a 1990 C4. Too much below that, it could certainly run into stumbling issues. Another problem is the cooling fans only Nov 2, 2013 · 1989 C4 Corvette engine stalls HELP! 1 reading Jump to Latest 9. This is when things start to get weird. Apr 27, 2009 · CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 Tech/Performance Keeps stalling :- ( C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine Jun 12, 2007 · C4 General Discussion - What could cause low idle ad stall? - Just got my new wheels and tires on and now my idle is real low, say 500rpm's and then it stalls when I put it in reverse. Ran fine for a week but now it starts immediately, begins to idle, then stalls out. Here’s a rundown of what’s going on: • Rough Idle & Stalling: The car starts but has a rough idle and almost stalls out when I shift into reverse. Car will run like a champ then all of a sudden miss sputter and die like it is out of gas. It runs at about 500 rpm and every 5-10 seconds it drops about 200 rpm and occasionally will stall. Apr 28, 2008 · 1990 L98 Runs smooth and then stalls without warning Jump to Latest 16K views 21 replies 10 participants last post by glenndaddy Aug 16, 2009 T Jun 11, 2022 · C4 Tech/Performance - Surging idle when cold then stalls - So this problem started to happen last week, I cold start my 84 and it idles fine at 1100 for about 2 minutes. Jan 8, 2006 · C4 Tech/Performance - '86 Idle and Stalling Problem - My 86 with 170k miles is having a problem at idle. Apr 15, 2022 · C4 Tech/Performance - 1990 Starts and then Stalls - Neighbor's 1990, fuel pump died, they replaced it. May 24, 2024 · C4 General Discussion - '84 IAC valves and stalling - I recently began experiencing stalling when I lift off the accelerator. Did I miss another wire or connector? 86 C4 Corvette - 14. I have replaced many parts including the mass air flow sensor and fuel pump idle air control throttle position sensor. I have Jul 27, 2012 · C4 Tech/Performance - 85 L98 stalls at idle, need help - Background on Vette: 1985 Z51, auto, stock, I bought it from the original owner about 2 years ago. Today I put the scan tool on it. Jun 24, 2009 · This tech paper will discuss the procedure for correct adjustment of the Minimum Idle Speed and for adjustment of the Throttle Position Switch (TPS) on the early C4 Corvette TPI systems. Jun 5, 2009 · 1989 Corvette starting and idle problems My 60K mile Corvette has begun to start only when it is cold. May 10, 2011 · 86 TPI Idles Rough, Surges, and Stalls? Tags c4 corvette idle bad stall Jump to Latest 78K views 77 replies 13 participants last post by konadale Apr 8, 2019 C4TPI Discussion starter Feb 16, 2019 · Hi I have an issue with my car where when I accelerate it cuts out and then the RPMs go up after about a second. It will not idle below 900 rpm. Any advice on what it might be I have a service appointment scheduled but I guess I’ll find out hopefully. 5 pistons, LT1 cam, hv oil pump, double roller chain, ported heads Feb 8, 2025 · C4 Tech/Performance - Stalling issues when driving! - Just bought a 1988 c4 and had a idle issue, i replaced the distributor rotor and cap and the spark plugs and the check engine light went off but the car still idles weird (500rpm -700rpm) and sounds like it wants to die out. It finally threw a code. This means it is constantly reading the Oxygen sensor, the coolant temperature sensor and Mass Air flow sensor. Feb 27, 2011 · C4 Tech/Performance - Starts but won't idle or stay running - I have a 1986 Vette that I just got this week that won't stay running or idle. Today I decided to wash my car so I started it up and drove into the driveway and shut it off. Mar 4, 2019 · C4 Tech/Performance - Rough idle then engine stalls - Hope someone here may be able to help. It Dec 29, 2009 · C4 Tech/Performance - L98 idle surge - Ok guys! hi I'm new here and a new Vette owner, I'm a professional diesel engine tech and been a rat motor fan for years. Feb 25, 2025 · I am now dealing with a rough idle/intermittent stutter. Next day I hooked up fuel gauge turned on ignition Jan 17, 2022 · My 1987 Corvette started stalling then coming back to life on its own. I have a 1989 Corvette C4 L98. Sep 3, 2015 · Now the car starts and runs but when I let it drop down to idle, it stall every time! I've checked the fuel pump, its working fine. The original problem was the car would run ok but then after in was driven for a while and the engine May 21, 2003 · C4 Tech/Performance - Stall on idle - I'm a fairly new vette owner and new to the whole injected computer car scene. When it warms up the car stumbles and dies. Oct 27, 2014 · When you start an L-98 engine Corvette, a series of events take place that causes the engine to run. I set the TPS today and it still stalls below 900 if he gooses the gas or even presses down and lets off. Feb 11, 2007 · C4 Tech/Performance - LT1 Stalling/Cutting Out - EDIT: PROBLEM SOLVED! It was the coil. - I have having an issue with my 87 corvette, where when you start the car it immediately stalls out within 4 seconds does not idle. 791 @ 98MPH K&N Air Filter w/ Opened Air Box, Hedman LT Headers, Borla ProXS Mufflers, Polished SS LT1 Tips, AIR Delete Dec 14, 2024 · C4 Tech/Performance - A Cry for Help: Problem with C4 Crossfire ? Unstable Idle - Good day! I finally purchased my childhood dream ? a 1984 Corvette C4 Crossfire with an automatic transmission. Sep 25, 2021 · C4 Tech/Performance - Stock 1989 L98, sputtering at idle and acceleration, stalling - Howdy yall, I?m new here so excuse if I get some terminology wrong! I own an 89 corvette with a stock L98 engine and it?s been acting up lately. The problem lies in rough idling, detonation when Apr 10, 2013 · C4 Tech/Performance - rough idle after it warms up - After I take it for a ride and warm it up. I have a 1986 Jaguar XJ6 with a 1989 L98 swapped into it by a previous owner (figured I'd ask here instead of the Jaguar forum as my problems are with the engine). Nov 19, 2002 · C4 Tech/Performance - Surging Idle and stall problems - This is what I've been getting ever since the ZZ4 was installed three months ago in my 90 coupe. This is causing stalling at times. Car revs normally with no hesitation while in park. I can reset the timing but do I set the timing with the EST unplugged and the car in Neutral or in park. drove about 2 miles stopped at a traffic light and my engine stalled out. This is for a 1991 L98, Apr 16, 2010 · It kind of looks like it's idling at 3-400? Is that too low? Yes, especially if this is the case on start up. Recently, I replaced my battery and my oxygen sensor which was followed by a sporadic idle where in P it goes from 500-900 and in D from 500-600. I would like to read opti low res and high res signals. I have to give a little gas to keep it at a higher idle to keep it from stalling. Aug 9, 2024 · Hey everyone, I’m new here and am aware that this has probably all been addressed a thousand times however, I am having some trouble with my C4 Corvette and could use some advice from those more experienced with these cars. Jul 18, 2008 · C4 Tech/Performance - LT1 idles rough and stalls when warm, Long term counts high - I am absolutely stumped. Sep 5, 2010 · C4 Tech/Performance - 1988 Corvette stalls when hot will not start up until cools down. The bogging issue happens when under load of any sort, especially when going up a hill. The engine was torn apart and literally in boxes, the PO was in the process of putting a 383 in it but never got it in. Best of my recollection, each random time, engine would stall when my foot was off the gas and I Jun 19, 2011 · Ok, still stalling and rough idle. It all began with me doing the lower intake gasket. 545 volts, checked out ok, turned car off, reconnected wire, disconnected battery for 1 minute. I wanted to bring everything together, into one, now that I've done some more datalogging and went through some FSM trouble-shooting charts. during this I also installed new injectors (oem specs). Car was warm, and stalled unexpectedly as I released the clutch in first to pull away from a stop Jun 1, 2007 · C4 Tech/Performance - Low idle / stall once warm and slowing to a stop - My 92 LT1 (blower + 383) 6 speed stalls when slowing to a stop. Jun 11, 2023 · 1996 LT-4 manual transmission starts and idles very rough for a few seconds then smooths out and increases RPMs for a few more seconds total run time about 10 seconds then shuts off. It will start and I can keep it going using the gas pedal but it sounds and feels rough. Fuel pressure checked and Oct 28, 2009 · Well I'm sure there's at least one or two other posts about this but I couldn't find them again so here's mine. Sep 24, 2010 · Has anyone had this problem where the car idles pretty good then when you give it the throttle or gas it then starts running super bad then stalls or dies it is a 1990 tpi I replaced the fuelpump, filter, blow out the line , installed new vapor line it was clogged, new distributor, coil, no Aug 19, 2012 · C4 Tech/Performance - Idles but dies when pushing the accelerator - I hope I can get some direction here or maybe someone has experienced this. Mar 6, 2024 · C4 Tech/Performance - C4 start and stall. Car starts and idles fine, but hesitates and backfires under acceleration until about 2,500 RPM, then accelerates normally once foot has been removed and reapplied to gas pedal. No codes showing up. My 86 Vette began stalling a while back so I decided to change a bunch of things in the hopes the problem would go away. Mar 27, 2016 · C4 Tech/Performance - 1994 Corvette stalls, cough's & backfires - My 94 Vette Stalls, cough's and back fires in open loop mode. My 95 A4 LT1 runs like a champ for the first 5-10 minutes after start-up. Nov 13, 2008 · C4 Tech/Performance - help!!! 95 LT1 idles rough and stalls when warm - hi, i have problems with rough idle when warm-up and at WOT it's knocking and poor acceleration like missfiring or not enoght fuel on one or more cylinders. Dec 26, 2011 · C4 Tech/Performance - Car heats up stumbles and dies - 1990 Corvette L98 M6 Stock. It has fresh gas though. Having some issues with my C4 corvette after driving I stopped for groceries I had difficulty to start crank it several times finally started up. I checked the timing and it is set to 6 BTC at idle. The engine quickly restarted, turned a corner to head home and the engine stalled again. No codes. Valve job on heads, new water pump, spa Apr 14, 2019 · CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 Tech/Performance 1987 Corvette Surging Idle, No Response to Throttle, and Idling High in Park. Before Sep 14, 2007 · What are some causes of a surging idle that causes a stall? My '85 4+3 starts like bat outta hell, but after 1-2 minutes of idling, it begins to surge and dump idle. The most challenging part of diagnosing a stalling problem is reproducing the conditions that led to the stall in the first place. runs like using regular gas but i use 93 gas. Nov 5, 2011 · I thought it was the fuel pump, my PSI reading was below 40 (38 or 39), I replaced fuel pump and fuel filter (In this case it benefited me, I now feel more throttle response, my idle is better and the PSI readings are around 45ish. Problem only Mar 13, 2011 · hi guys ,my 85' C4 has an orrible wobbling idle . May 25, 2007 · C4 Tech/Performance - low idle stalling on my 89 - I've searched and gotten some good info on how to start trouble shooting my low idle stalling problem. Mine idles at 900 before settling to 600 at idle and drive. There is no check engine light. Scroll down, there's a pic of the idle adjustment screw on the throttle body too. To explain exactly what was happening, intermittantly when the motor had a load on it the idle would get rough and it sounded like a cylinder was shutting down for short periods. I've changed the IAC valve, TPS, and brake booster with new parts and still it idles all over the place. Throttle Position Sensor (TPS) – Trying to figure out a way to measure the voltage of the sensor, so this is still an open item. I have replaced the fuel pump, fuel filter, new fuel injectors, new Sep 15, 2007 · When they go bad, they typically work good at an idle but tend to start breaking down as the engine load puts more of a demand on them. I bought the car running but wanted to clean it up some. pxgd b3 fg17 gdhp 6r0u 148g wqex 9tgr5 sf8 y8b6