Just got a bike running after about 15 years of sitting up. The carbs were so bad that I had to dismantle every one and soak in carb cleaner. The butterflies were stuck solid but after a 1 day soak they are free. After installing and running. ( I did set the valves and sync the carbs) the bike will idle fine but when you give it gas it is somewhat slow to come up but it takes a while to idle down. I have checked for vacuum leaks ( spray carb cleaner around boots) with no increase in idle. We did overhaul the carbs which only included the few o-rings and needle/float assy. Any Ideas specifically where to look?