Thread: W210 Rough Idle
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  #4  
Old 05-04-2007, 07:56 PM
okc329 okc329 is offline
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Join Date: Feb 2002
Location: St. Louis, MO
Posts: 340
Rainy weather could be

causing an arc from a plug wire to a ground. When air is moist, it becomes more of a conductor. Put car in a dark garage and run engine while idling roughly. Look for arcing off of plug wire.
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