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[Ironman361]

       I own a 2005 fatboy SE that I bought used. The previous owner installed a kuryakyn wild things air fuel controller.  I am experiencing some backfiring at decel and was wondering if anyone else has this installed and at what settings.  I also have Vance and Hines big shots and what appears to be the original air filter and EFI.  And at the risk of asking a stupid question, could a different brand or octane of gas cause this?  Any input would be appreciated, thanks, Bob.