I have a 1998 Z/28 Camaro with the following modifications: GM Hot Cam, Edelbrock heads, FAST 92mm intake manifold and throttle body, SLP long tube headers, SLP catalytic converter and oil pump.

At times, the car runs flawless. Then, at other times, it won't idle and dies when I come to a stop. It's unpredictable. I recently replaced the IAC, and I'm still having the same problem. I've taken it back to the tuner three times, and still no luck.

I'd appreciate any advice that anyone has to fix this problem, thanks.