I have a 2003 Dyna Low which seems to be running lousy and won't hold a consistent throttle speed. Okay at idle and runs good at 3000 RPM's but hesitates and sputters at anything below 3000 or above idle. I purchased this bike used this spring with 40K and not very familiar with carburated engines, however I have pulled the plugs and they are very fouled (black soot) and replaced them, but I doubt that's the solution. I also wonder if the jets are correct as this bike has Screaming Eagle pipes, so thinking the carburator was never set for the reduced backflow/compression. Am I on the right path, or should I be looking somewhere else for the fouled plugs? I am leary of running this bike too long or too far for fear of damaging/ruining the engine since it has so many miles on it.