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check for vacuum leaks. mine was doing the exact same thing and i had two major vacuum leaks that only leaked during boost, not at idle. they were in the vac to my BOV and the vac line to my boost gauge. i fixed the vac leaks and my car runs great now and pulls hard like it used to before the leaks sprung up. i thought my leaks were coming from my intercooler piping but i was wrong.
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