Hi, I have an issue with my 2003 VTX 1800C. It just started running really rough "not firing right. I checked the spark plugs and they all seem to be sparking. The very front coil ( by the top of the tank) is new and the one closest to the seat (bottom one) is only a couple years old, but all plugs are sparking. The gas level is fine. Has any one else had the problem? Any help anyone could give would be greatly appreciated.