I have an 03 flhrci with an bigbore kit. The problem is it just quits running or spitts an sputter an wont take the fuel when the throttle is turned. when it quits and finilly starts it might rev on it's own.Have had it to many shops and at that time it's not broke. They check connetions and fuel system. Any help would be good.

 

Check for faulty sensors.I'd start off with checking the crank pos. sensor and throttle pos. sensor.