Intermintant stumble, no errors?

01 Blackbird, No power commander. I have had a intermittent stumble, cylinder drop out. Down on power when it happens. I thought that I had it traced to a problem with my Audiovox cruise. I was pulling the RPM sense from a coil input. No vampire clip, just a spade lug double connector. The bike had gotten un rideable. When it failed, it would surge often, and idle would be 200rpm lower and rough. Often, blipping the throttle seemed to clear the problem for

Have you ever replaced the fuel filter? I don't know if 01's had the test connectors, but it could be an issue there (I know 99's have a negative connector by the battery but there is also a positive connector on the clutch-side frame rail next to the engine that will corrode, been there!) You might also want to make sure you don't have a corrosion issue at the spade connector where it attaches to the coil. The rubber boot will get brittle with age and will trap moisture in it, or possibly ev