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Popping Under Full Boost


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2010 5.4 Kenne bell 3.6, American racing headers, borla exhaust, id725 injectors, efi dyno tune only 5400 miles on it. It has been running amazing but last night it started popping under full boost. Sort of spit and sputter on hear it out of the exhaust. Could it be knock from bad gas? Thank you for the help. I tried to search the problem but couldn't find any answers.

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