Originally Posted by da_grey_goose_95
well i actually had to switch the pcm also cause after i got the engine instaled it'll run for afew hours then it jus started shutting down while i was driving or sitting at idle ! so thats when i took it back to the shop and the told the guy wut it was doin, and i asked him if the pcm would have anything to do with it shutting down cause i know enough to diagnose a vehicle myself and everything that i checked that i thought i would make it shut down was fine. so he ordered a pcm for the 99 grand prix and i havent had any problems since ! so does it still matter that i changed the pcm if a 99 is obd 2 ?
So who did all the wiring? Since those two PCM'* are totally incompatible with each other, dozens of wires would have to be spliced in. I think you either misunderstood your mechanic, or he has no clue what he'* talking about. If your PCM is still under the dash on the right hand side and there are no splices, you don't have a 99 PCM in that car, nor would there be any advantage with the 99 motor and/or 95 PCM. In fact, the PCM in the 95 on the L36 is the least-restricted factory programming the L36 ever saw.
Sell the car and buy an SSEi if you're thinking of a supercharger. There are other options, but that is by far the cheapest.