first of all i have a 87 iroc-z 305 tpi. for about 3 months now whenever i come to a stop it tries to stall out after i am idling for a few seconds. i have been putting it in neutral and keeping on the gas to keep it running. its even trying to stall in neutral unless i keep it over 1000 rpm. so far i changed the coil, fuel filter and o2 sensor. its driving me nuts. please help.

 

it only does it after it warms up. when i first run it it runs great. and no computer codes come up.

 

vaccum leak...

 

IAC dirty or passages for the idle circut.