1993 GMC Jimmy rough idle

Tiny
BIGFRED1972
  • MEMBER
  • 1993 GMC JIMMY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 177,000 MILES
What could cause rough idle and excessive carbon out exhaust pipe
Tuesday, December 29th, 2009 AT 6:20 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine 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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Tuesday, December 29th, 2009 AT 8:01 PM

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