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I wonder if yor timing slipped and that's what caused the rough idle. Then because the vario-cam kicked in when you blipped the throttle thus altering the timing eve further caused a colission of valve to piston.
Never a good thing though.
Chris
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1999 986 2.5L, Stock Exhaust (S muffler), EVO Intake, 18" Stock rims (17" during winter), IMS Upgrade, 150k+ miles and counting!
87 944S brought back to life
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