I have a 1994 LT1 Camaro with hotcam, 1.6 RR, headers, 3" exhaust, pcmforless custom tune, and pretty much any other bolt on. I just completed the rebuilding the motor and also have new bearings, gaskets, timing chain. I ran the car for about an hour then took it for a spin but idling still below 500 rpm's. It will not idle on its own. I checked for vacuum leaks but found nothing. Anything else I should be looking for??

 

What idle speed did they program it for? Is it an A4 or M6? What throttle body are you running? Did you check the IAC counts? Are you sure the IAC motor is plugged in and working?

 

The idle speed was suppose to be around 800-900 rpm. My iac is plugged in. I have a stock trottlebody. Maybe I just need to drive the car more for the computer to re-adjust for all the mods.