hmm Pcm then i guess, someone with more knowledge than myself should chime in...
in the mean time Ill bump ya back up

 

Hey i had a prob kinda like yours i have a 93 z28 it was runnig fine ran good cold then one day i killed it and it would not start for nothing here is a good trick to test that icm it sound funny but it works take it off the car and put it in the frezzer 4 about 30min put back on while it still ice cold it should fire up run till it gets warm and die...It worked 4 me saved me hundreds,put a new icm on it and were off again..lolhope this helps....

 

thats actually a good idea. icm(s) dont like heat

 

I had no luck with a different PCM. Would the oil pressure switch have anything to do with my problem? Maybe a crank sensor or something? Please help.