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      12-29-2012, 01:38 PM   #2
Jeff@TopGearSolutions
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Drives: C6 Z06, 09 335i, 10 335xi
Join Date: Dec 2008
Location: www.TopGearSolutions.com

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Have you changed your spark plugs yet? Everything you described sounds a like a misfire and spark plugs should be changed every 25,000 miles.

If you are getting an underboost code repeatedly then you are leaking boost somewhere, it might not be the charge pipe, it can be 1 of many vacuum lines or the connects to the pre intercooler or post intercooler side.
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