Okay, I think that I may of had a similar problem with my car. it wouldn't rev past 4k, and it sounded like it was getting fuel cut the whole time. try to check your afm, also try to check for boost leaks. Another thing that I would try to do is disconnect the battery for about a minute and let the computer re-set itself. sometimes that will do the trick too.
Are you getting any check engine lights or fault codes?
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