I have a 2002 VTX 1800. Plugs were changed a 1000 miles ago. Acceleration is fine if I do not open the throttle all the way. If I open the throttle, it cuts out like it is not hitting on both cylinders.
When? There is a rev limiter that kicks in at 5750 rpms, and when you hit that it will drop a cylinder. Once you shift or drop the throttle it stops the limiter. If it happens when the engine is winding out just before you shift, it's the limiter