HD 2008 1200 sporster studder,coughnot consistent when turning throttle fills like its missing not bad but bad enough to b annoying fuel good spark good(plugs) wires good air filter ok no vac leaks, 02 sensor good.thinking its a fuel problem fuel?... more HD 2008 1200 sporster studder,coughnot consistent when turning throttle fills like its missing not bad but bad enough to b annoying fuel good spark good(plugs) wires good air filter ok no vac leaks, 02 sensor good.thinking its a fuel problem fuel? pin hole,junk in fuel filter,crank sensor sure any other guesses could be a worn wire for injectors anything would help thanks. (fuel injected)