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