I recently used my carbtune to sync the carbs on my 82 GS1100E. I thought it might help with an off idle stumble/miss that was only present at the smallest throttle openings. Adjusted fuel screws while I was at it and noticed that the rpms did not respond to adjustment of carb three. Seeming to indicate that it was actually not firing. I realized after going through all this that the problem appeared to be ignition, but when I pulled the number three plug after a prolonged idle, it was dry and looked like the others. Now yesterday I rode the bike and it's missing badly at all rpms. I think missing on two cylinders. I've read some about coil and ignitor failures on these bikes. Not sure where to start. Suggestions? I was planning on aftermarket coils and wires. Seems like this would be a good starting point...