1993 Pontiac Grand Prix misfire

1993 PONTIAC GRAND PRIX
215,000 MILES • 6 CYL • FWD • AUTOMATIC
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CONFUSED!!!
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  • 1 POST
ok here we go...my car dont go over 35 without a bad misfire then a backfire and then it dies!! i have replaced the following item with no improvement...fuel pump,fuel filter,plugs,plug wires,all exhaust parts,map sensor.throttle position sensor,iddle air control valve,i have checked the timing, and finally the engine control computer....what else should i check and replace?
Apr 1, 2010 at 6:03 PM
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RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
1.Defective spark plug.
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
Apr 1, 2010 at 6:44 PM
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