1998 Harley 1200 Sportster (Custom) began skipping this weekend, after it you go several miles it clears up and runs fine. Once you turn it off it start skipping again. I have changed spark plugs, plug wires, getting fire from coil to plugs, rear cylinder not firing. Compression seems good on cylinder, exhaust putting out , but only cold/cool air. It seems that I am not getting any fuel to the read cylinder, any ideas what to look for?