1999 mercury grand marquis

Asked by Jan 12, 2016 at 07:06 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

I have a miss in my engine at idle more
profound driving on rd like a bad plug wire i
changed plugs coil pack fuel filter cleaned
out throttle body other stuff car is using
more gas now because of slight miss i been
a mechanic for over 40 years can't figure it
out any idea please help

1 Answer

66,015

Maybe check the compression. A low cylinder will cause a miss.

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