Working on an 87 XLH 1100. Bike has a hiccup at low speed when you roll on the throttle. The carb is stock and has been rebuilt, thoroughly cleaned and new gaskets and seals. Has a RevTech ignition and a set of VH pipes. I have not checked the timing yet, waiting on a plug. V.O.E.S. is new and working properly. Idles great and if you get on it the things never misses a beat. Any suggestions as to what is causing the hiccup?