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you're gonna have to be more detailed if you need help:
Did you drive the car back from the tuner? If so, how was it driving then? Did you ever drive it hard after the "tune"?
Did you do any kind of work around the engine bay afterwards?
What exactly is the car doing? Does it drive perfectly good until positive pressure starts showing in the boost gauge? Or is it only at higher psi? When boost doesn't "kick in", does it only feel sluggish, or does it sputter?
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Tuners are big bullies 
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