2000 Pontiac Grand Am rough idle

2000 PONTIAC GRAND AM
85,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
JPATTON14
  • MEMBER
  • 1 POST
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.
Dec 11, 2008 at 1:09 PM
Advertisement
Avatar
RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 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.
Dec 11, 2008 at 1:50 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.