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my '02 Raptor is new to me and back fires as I let off on the gas.

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Discussion Starter · #1 ·
My '02 Raptor is new to me and back fires as I let off on the gas. I first ran 86 octane then change to 92 octane and changed the sparke plug. It still back fires but not as bad. It has been modified, but not by me. It has a DMC pipe and it's been jetted. Any suggestions for the best way to resolve this issue of mine.
 
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