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Originally Posted by fotios335i
any suggestions as to what it could be?? Maybe some ideas? You helped me when I was having problems with the jb3 when I switched over?
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I know you said you tried 65% user tq and still had the issue. What happens when you put it at 0% user tq, which would be stock level boost?
Maybe with a tune, the extra requirements for fuel, or boost are showing you the start of an engine hardware problem that will eventually show up at stock levels.
Sniz has an excellent post on how to check for boost leaks. After that, I would try spark plugs. If it still occurs, have the dealer look at coils and injectors.
Boost leak test:
http://www.e90post.com/forums/showthread.php?t=193077