Engine Performance problem
1993 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic 185000 miles
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hello i have a 93 pontiac grand prix with a 3.1 and it keeps sputtering and then quits. i can start it and it will run for about 30 to 45 minutes and ten it starts idling rough and then dies. i have replaced the pcv valve,map sensor,oxygen sensor,throttle position sensor,egr valve,idle air sensor,and the fuel filter. i dont know what it could be. maybe in the fuel system? any comments or answers will help. thanks

check the ignition module, ignition coil, spark plug wires, and spark plugs first.