I have a 2003 FLHT with V&H Dresser Dual headpipes, Rush w/2" baffles and stage 1 a/c with stock ECM. I am running map#807-033 seems to be the closest. I have a backfire at 2000 rpm with 0% throttle. It drops down until 2k and then pop! If I give it very slight throttle it lessens or eliminates it. I am told I can tune the decel and after trying a couple different maps I have found this one to be ALMOST perfect. Any help would be appreciated!