I have a 2003 vegas. It was running great then quit. I put new plugs and battery and cleaned the throttle body. Will run when I put carb cleaner then it dies. It has 2250 mile. It sat for a while in a garage of the person I bought it from. It just got a new oil change about 100 miles ago. Was running good. Right before it did not start it was sputtering and backfiring. Is it the fuel pump or fuel filter. Need some help please.