1998 Chevy Malibu Rough idle

Tiny
BUGED66
  • MEMBER
  • 1998 CHEVROLET MALIBU
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
What would make the idle very rough. It bounces between 500 rpm and 1300 rpm. It does this in park.
Wednesday, July 28th, 2010 AT 11:59 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause 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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Thursday, July 29th, 2010 AT 12:05 AM

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