Thread: Stumbling under high boost.
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      05-16-2014, 05:59 PM   #5
NathanIngrao
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Drives: 2009 135i
Join Date: Apr 2014
Location: Florence, AZ

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Could be spark plugs. Do you have 52k on the same plugs? A tuned car is recommended to change plugs every 25k to 35k depending on how much you work the motor.
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