1999 Mercury Mountaineer ignition missfire

1999 MERCURY MOUNTAINEER
186,000 MILES • 6 CYL • 4WD • AUTOMATIC
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FARROWM
  • MEMBER
  • 1 POST
the car seems to run good when cold but when it gets warmed up it starts to missfire. i changed the spark plugs and spark plug wires and it didnt help. i took off one of the spark plug wires on the coil after it was warmed up and it was sparking eratically.
Mar 1, 2010 at 10:05 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Has the check engine light come on?
Mar 23, 2010 at 12:39 AM
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