Cylinder 4 & 7 misfire.
#1
Cylinder 4 & 7 misfire.
I have a 2001 mercury grand marquis with 99k miles on it. Its missing on cyli dear 4 and 7 according to the computer. I have changed the spark plugs, intake manifold, fuel filter, fuel pump, and drilled holes before the cat converters. Yet it still is misfiring. Any ideas on why?
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