I have an 07 Road King Classic with a Big Sucker filter, Vance and Hines Dresser Ovals, and a PCV. I am at my wits end, the bike is popping/backfiring on decel. I had an exhaust leak between the muffler and the head pipe (fixed it). Jaime from Fuel Moto has sent me 3 different maps (to no avail). The popping persists whether I run the bike lean or rich. Yesterday, after I fixed the exhaust leak the bike threw a couple of codes "p1353- front cyl no combustion, and u1097-Loss of speedometer serial data" Also my fuel mileage has declined significantly, when the Power Comander was installed I initially got 27 mpg, I am currently getting 35 mpg with what is supposed to be a fairly lean map. I am thinking that my timing may be off, but that is just a guess. Can anybody give me some advice, or maybe point me in the right direction ?