2000 Pontiac Grand Am Engine miss

Tiny
KEVIN MORAN
  • MEMBER
  • 2000 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 155,000 MILES
Car usually starts fine. When put under load the engine misfires/bucks. Can get car up to highway speed by easing into the throttle but any time you give it too much throttle the RPM drops and car bucks.
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Tuesday, March 16th, 2010 AT 6:32 AM

1 Reply

Tiny
RASMATAZ
  • MEMBER
Engine running rough or misfiring can be cause by the following-inspect and test all the following below:
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.
10. Throttle position sensor.
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Tuesday, March 16th, 2010 AT 8:43 PM

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