Mechanics

ENGINE MISFIRE

2006 Mercury Marquis • V8 • 70,000 miles

2006 grand marquis. Engine stumbles only when snow is in the air. No check engine defaults or codes. Otherwise it runs smoothly.
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Steve Scholten
January 10, 2011.



It sounds like you have the beginning of a failing coil. When it gets worse the computer will identify which cylinder it is with the check engine light.

Wrenchtech
Jan 10, 2011.