I have seem to have always had the problem of my plug wires getting what i assume is carbon deposits on the inside of the plug where it connects to the spark plug. One why is it doing this? Two is there away to prevent it? Three is there anything better then carb cleaner to use on it? I have used carb cleaner on all the plugs wires about ever 7k miles and this set has only about 15k on them. Do the newer COP set up have this problem too? (and duh yes it is affect the spark performance)

 

Carburetor cleaner may be part of the problem, it's a pretty harsh mix of organic solvents.

Use WD-40 instead, it was designed to displace water (Water Displacement formula # 40) and was quickly found to also work well on high voltage electrical systems. I had a '73 Jeepster that would stall out every time I drove through water more than 2 feet deep--pop the distributor, spray it and the wires with WD-40 inside and out, fire the puppy up.

I did this more than once in the middle of streams that turned out to be deeper than I thought...

 

I used to used WD40 but i found it didn't help that much. This last time i used carb cleaner and the an air duster to clear it out. Maybe it will work better. I just find that it funny that the new plug wires do it too. Could this be anything to do with spark plug temp? I found that some of the rubber boots are softer then the others too and i thought that was odd.