I have a 1992 B4C camaro w/ the B2L 350. When the car is cold it idles and drives fine. But when it heats up it has an eratic idle and even chugs when driving. I have noticed when the a/c is on it idles fine but once it kicks off the idle goes nuts and chugs when driving. There are no codes in the computer either. Any suggestions appreciated.

 

I had a problem with my idle going wacky immediately after turning off the AC. Then it would go back to normal, besides an occasional stall here and there. Turns out the problem was the IAC motor. Here's an easy way to check if this is causing your problem: Turn on the AC and have a friend put the car in drive. When the compressor is on and the car is idleing at a decent rpm, like 700-800, unplug the wire going to the IAC motor. Then turn the AC off and go for a drive. If your problem is gone, then the IAC is bad. If it's still there, then at least you know it's not the IAC motor.