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Did you check all of the couplers for your piping? Make sure you have no major air leaks in that system. I used to have a similar problem and it turned out to be a smallfracture in a coupler that only opened up under boost. You have to physically remove and check each one sometimes in order to find it if this is the case.
Clean out your MAF, seen RB25 and Rb20's sputter alot and act like they your description when MAF's go bad or get too dirty.
Everything else I can think has been covered.
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