Pontiac Repair: 95 Pontiac Grand Prix GTP, crank shaft position sensor, throttle position sensor

Question
Last month I bought a 95 Pontiac Grand Prix GTP. It had a 3.1 motor swap. The car has a major problem running. It will start and run, but only for a short time. It dies shortly after 5-10 minutes. Then will try to start after stalling. But after 3 re-tries, the car seems to kill spark to itself. I've replaced the ignition control module, all three coil packs, crank-shaft position sensor, ignition switch, idle air control sensor, throttle position sensor. I've monitored the fuel pressure to make sure it stayed close to consistent, and stayed at 40lbs the entire time. Nothing seems to keep this car alive. Can you help?!!??

Answer
Hey Michael:

Are you sure it's loosing spark? get a cheap spark tester at the store and put it on one of the plug wires and see if your loosing spark or not. Start there. If it is loosing spark for sure next thing I would do is when it looses spark make sure you have power and ground to the ignition module the is the small 2 wire connector with the balck and pink wires on it. If this had an engine sawp you may have a gound issue that when it get hot you are loosing what was a good grounf cold but as the temp increases the gound gets worse and worse. Check the wires with a test light to load down the circuits and a volt meter sistered up to the light test leads to see if you indedd have battery voltage to the module. My guess is that that's the issue. This engine will have spark on it's own with out the computers input I belive Ithas it's own power and ground and the crank sensor plugs into the module so if the module sees engine speed from the crank sensor and has poer and ground it should have spark once the engine hits a certain rpm the computer takes over control of the spark advance. hope that helps you out some good luck :}