what could cause rough idle and excessive carbon out exhaust pipe
Dec 29, 2009 at 10:20 AM
1993 GMC Jimmy rough idle
BIGFRED1972
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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.
Dec 29, 2009 at 12:01 PM
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