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Two weeks at the dealership and got it back.
No tune trace on the PCM. But I also swapped back all the OE parts before taking it in...I mean who tunes and Buick, right?
Confirmed cracked piston and ring. Rebuilt engine and feels like a new car again.
Undecided if I should flash the tune again and put everything back because I actually like the car stock...for now.
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