2002 flhtcui Andrews 26, oil pump upgrade, se ac, slip-on kuryanin mellow crushers and fuel pak, fp-1204. Got everthing together map in place bike ran bad always nudging and missing a beat. techs goofed around with map settings got worse then better then bad. So, spark plugs changed out, plug wires changed out. Ran good but still nudging and like missing bad at 2800-3200 rpm range. Now iam thinking fuel injectors dirty, off comes the fuel tank check around for loose wires, disconnected and check connections. called hd dealer tech. told me to remove fuel pak and slip ons to stock pipes did it now bike wont start just rolls over then back fires. pull plugs out checked for spark couldn't see much but it need back fire. now what coil bad. vapor lock I disconnected the fuel line quick connect. need tech help or call hd cripple wagon.