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      10-09-2012, 01:21 PM   #11
King mode
First Lieutenant
 
Drives: 335xi
Join Date: May 2012
Location: Denver

Posts: 373
iTrader: (0)

I friend of mine has had trouble with the power "breaking up" above 4000 rpms with his jb4. Its on and off though. I would do new plugs and if that doesn't help, check coils.
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2008 335xi AT
Cobb AP stage 1, drop in filter, the rest stock
13.10@106.01 w/ 1.86 60' (5,800' altitude)
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