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Sounds like your wastegate is not working right.
I would clean the plugs up, check the waste gate, and BOV, then full reset the computer and try again. Run a can of Techron in the tank and fresh Aamaco or Cheveron fuel.. 93 of course.
If the turbo is no longer "singing" its way up...well it could have siezed...certainly hope not.
Also, I am sure you know this, 1000 mile oil changes are needed for good turbo durability..and keep an eye on the fuel filter, and the engine temp.
Black oil, no good at all. Turbos KILL oil...big time.
Sounds rather minor..perhaps you let off the gas pedal at the wrong time too...driving a turbo demands some dynamic knowledge of the system...what goes on.
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