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2000 Pontiac Grand Am idles and runs rough

Tiny
KIP250
  • MEMBER
  • 2000 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 180,000 MILES
This car idles and runs rough but picks up and goes just fine above 2500 rpm. I took it to autozone and their code was bank 1 running lean. After replacing a few things (that didnt help) I took it to a, not so great shop that said all four fuel injectors were bad. Well after replacing them the car ran good and the check engine light whent off for about a month, then back to the same problem, and it kinda pops out of the exhaust like it is missing. Any help would be great, thanks.
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Saturday, September 18th, 2010 AT 3:00 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be caused by the following:

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.
11. Idle air control valve.
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Saturday, September 18th, 2010 AT 4:40 AM

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