I have a 2010 Flhrc stage 1 with a Ki-Tech fueler (came with the bike) The problem is intermittent. the engine seems to miss a firing stroke. some times continuous stuttering like its hunting or intermittently blowing head gasket. Some rides its real bad other times it's not there at all. Sometimes just in the background, other times all most unrideable then back to not bad or gone all together as u ride alone. Been like this for about 400 miles. any ideas, has anyone had this type of thing ? Deal recons its the Ki-tec an advises i invest in a sert £600 odd pounds over here. any advise as to what to check would be great thxz.