can't figure this one out

I have a 91 rs with a 305 TBI. The car will start and run great sometimes, but other times it starts fine and then tries to shut off.The engine will idle up and down and if i don't rev it up it will cut off.After reving the engine it will run fine. It does this cold or warm but only every now and then. I thought it may be flooding but there is no black smoke or gas smell from the exhaust. It has good fuel pressure and I have replaced the ignition module,map sensor , ecm, cleaned the throtle body, new oxygen sensor, new knock sensor. Any thoughts on what to try next ? Thanks to all who reply.( cman23)

Welcome to the forums

A bad or dirty IAC motor perhaps?

did you change the cap and rotor yet?

[QUOTE=DaMoNe6969]Welcome to the forums

A bad or dirty IAC motor perhaps?[/QUOTE