Hello, i have been having this problem for some time now. i have a 2008 ultra with sampson straight slip-ons, high flow air cleaner and a V&H fuel pak. my problem is after driving on the free way for a while, when i exit, the next light i have to stop for, i take off and the bike feels like is running on one cylinder and viberates alot until i shift into second or stop and take off again. i put the fuel pak in thinking that it wasnt getting enough fuel, but it still does it on occasion, and now the bike lurches at low speeds. a couple of things im thinking: 1. clutch - but if it is the clutch i would be having problems all the time. i do have SYN3 in the primary, maybe the clutch is slipping because of the fluid. 2. fly by wire throttle, maybe there is an update that i need or something? 3. the running on one clyinder shut off is staying on, and i need to shut off or an update? any suggestions would be great. i dont think it has to do with my mods, as the bike was doing it before.