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      11-29-2012, 12:57 AM   #3
Dackelone
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Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

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I would start with new spark plugs. High load low rpms sounds like a miss fire to me. The plugs should be replaced every 45K miles. And with a tune about every 20K miles. Only use BMW spark plugs.