Pontiac Repair: 95 Grand Prix stalling, throttle position sensor, crankshaft position sensor

Question
I have a 1995 Grand Prix which is stalling for no apparent reason to me or anyone else. When it stalls it simply turns off, no sputtering or skipping, no running rough at all! it is almost like someone just simply turned the key off. so i have check and replaced the Ignition control module, ignition switch, oil pressure sensor, throttle position sensor, idle air control, the fuel pump relay (even though it was fine) and then checked for constant pressure in the fuel line (40psi even two days later after sitting), the starter and alternator are less than 6 months old and are operating correctly, the crankshaft position sensor, also the spark plug wires are new plus a recent tune up. the car would run and work fine if it would just start and stay running for more then 2-5 minutes.

Answer
Hey Josh:

your all over this one... I would get a spark checker and put it on one of the plug wires and let it run untill it stalls and see what your loosing. Keep the fuel gauge on it as well and see what's going on. You could have an issue with wiring between the ignition module and the crank sensor. measure the resiatnce of the crank sensor at the connector for the ignition module The wires are purple and yellow The resistance should be between say 800-1600 Ohms. when it does check it again. If The hotter the car is the higher the resistance value. If it way higher than 1600 then I would look at high resistance in the wire(s) of the sensor I know you said you chnaged it already. If you live in the rust belt take a look at the terminals in thje engine control module especially the 2 lower connectors. the computer is in the right front under the fuse box. Thy have a tendency to corrode badly. Also take a look at all the grounds on the car. The body ground under the battery and all the grounds on the transmission to engine mounting bolts If any are loose or corroded or look green cut the wire back untill the copper look nice and clean and splice in another wire to the engine ground. That's a few other places to look. With out an engine scan tool your kind of out of luck and shooting from the hip. With a scan tool you can look at all the data and also take snapshots of the stall event and see what you loosing to make it stall out. Good luck :}