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      12-04-2012, 12:46 PM   #4
Wedge1967
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Drives: '07 e92 AT Sport Montego Blue
Join Date: Sep 2011
Location: Portland, OR

Posts: 2,173
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The n54 is notorious for a slight shudder at idle almost as if it's missing. I took my car to the dealer about this issue when I first bought my car because I thought something was wrong, but now I just live with it. Plug change did help a bit, now it's not as drastic as it was in the past. Apparently it will never be the smooth running engine at idle as we would all like it to be.
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