I just pulled out the plug and it is fine, slight brownish colour on top, no carbon deposits or oil deposits....

The plug connector has a little hole in the rubber boot, causing some spark to go through it......

This must be the cause of the shaky idle right???

Please advise guys, much appreciated.

Mike McKinney

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1989 300CE - 269,000 km
1994 SL600 - 59,000 km