Engine misses on snowy day in winter but never in the summer. what's up?

Asked by Oct 03, 2013 at 08:16 PM about the 2006 Mercury Grand Marquis GS

Question type: Maintenance & Repair

2006 Mercury Grand Marquis. 250,000 km. Engine misses on snowy day in winter but never in the summer. what's up?

1 Answer

25,815

Look for the easy stuff first. Check for vacuum leaks. A cold engine exaggerates a miss and it could also be a leak, when cold, and then as the engine warms up and expands, the leak is sealed again.

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