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2000 Pontiac Grand Am rough idle

Tiny
JPATTON14
  • MEMBER
  • 2000 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 85,000 MILES
Changed fuel filter. Took it in and was told it was missing, so I changed the plugs and wires, it didn't help. Then was told it had a vacuum leak on the injectors, so I replaced to o-rings, didn't help. Cleaned some of the sensors. No engine light ever comes on. If I put it in neutral or park it still idles rough but not as bad.
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Thursday, December 11th, 2008 AT 1:09 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Thursday, December 11th, 2008 AT 1:50 PM

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