I have a 1991 Camaro RS with the 5.0 TBI. I bought the car, and due to a problem with the steering column, it sat for about 16 months until I could get time to fix it, which I recently did. During the down time, the battery totally died, so I replaced it. When I tried to start it, it backfired, stumbled, and refused to stay running. In the course of checking things out, I found that the distributor had a bad shaft bearing, so I put a new distributor in. I have also found out that if I unplug the MAP sensor and the TPS, the car will run perfectly at ~ 1,500 RPM, but the throttle has no effect other than to allow too much air into the engine (no extra fuel injected to account for throttle position change). If I plug in the TPS and the MAP, the car will start, but immediately miss and die unless I pump the throttle rapidly to barely keep it running. The TPS voltage changes with throttle movement, and there are good voltage readings at the MAP. I'm thinking the ECM has gone south. Any guesses?