90 Camaro – Rough/High Idle

[monk02]

I had a situation recently where I had the engine stall when coming up on a stop sign/light and had to restart the engine. I have since taken the advice of the suggestions posted here to solve that problem. I removed the EGR Valve and the IAC Valve and cleaned the carbon deposits, reassembled, and performed the Idle Learn Procedure which solved the stalling problem. Now, I seem to have an issue with the idle fluctuating up/down on a cold start and then settles down after a minute to a rough idle. After driving and getting vehicle to temperature and later putting it park, the idle runs high until I tap the accelerator and then it returns to an idle that is normal. I removed the IAC Valve a second and third time to examine it. The vehicle has about 50,000 miles on it. Does anybody think it might be something else ?.....

[Tech II]

Make sure the throttle plate is not sticking.......look for vac leaks when starting yo cold by spraying carb cleaner around the top of the engine......