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the pcm may have a cracked board, i had an 88 cavalier z24 with the same problem, replced the ecu and it ran fine, the problem is that the boards inside the pcm crack and lose connection, the next time it acts up open the glove box and try tapping on the pcm, if the car responds at all, the pcm is bad
Probalby not, seeing that's what's telling your over heating. it wont be a bad idea to remove it (be carefull of hot fluid) and clean it off and put it back in. (wouldn't hurt anyways) but this problem is most likly a falty relay form the PCM to the fans. wireing might be corroed and need to be cleaned. check the fans for power and gorund with an omh meter.
It sounds like your IAC,idle air control,this unit controls your idle once your choke completally shuts off.on 2.8litre it is located right side of engine just above where your fuel lines go into your manifold ( fuel rails), it's held in by 2 screws &looks like a little electric motor, it's actually a soliniod, inside is a little pinnacle that goes in and out and is controled by the computer.good luck.
replace all vac lines first , then you need to get someone to run fuel pump pressure test to be sure you are getting proper fuel pressure , then take o propane torch ( not lit of course and go around all vac lines and intake with motor running and see if motor speeds up when you are holding it next to any suspected vac leak the tranny in this mod shifts off electric solenoids check to be sure all battery connections are clean and that i wire that ground the motor off the battery is in good condition and clean and tight , however the main care should be to vacuum and fuel pressure