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What would cause my car to misfire in 1 cylinder but only when engine is cold?

(2004 Volvo S60)
in Petaluma, CA on October 17, 2012
Cylinder # 2 is misfiring when engine is cold. The compression on that cylinder is around 55 but only when engine is cold. Compression is normal when engine is warmed up. Had new ignition coil installed on Cyl #2 and new plugs as well as injecting top engine cleaner and cleaned PCV system. All to no avail. Engine light stayed off during hot weather but comes on in colder weather with misfire code.
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Popular Answer
on October 22, 2012
Check for a vacuum leak at the intake manifold, near cylinder #2. (second from the left)
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