I was messing with my distributor today, and I was trying to diagnose a weird miss I guess, my motor seemed to have. All the plug wires tested fine, all the plugs looked almost new (only have a couple hundred miles on them, so they should look good), all the piston tops are lightly blackened by carbon. I took the cap, and coil off and this is what I found. First pic is of the cap that came on the distributor from TA Performance. Never touched it. Took it off once to see inside. Put it on the motor, worked fine ever since. Other picture is of a spare never used cap I had lying around. The TA cap looks all worn down in that area, and it had a bunch of ground up plastic on the little silver nub and the contact on the rotor was blackish. I cleaned the rotor and I put the new cap on. Runs fine, if a bit better than it did. Belt squeals so bad I couldn't really check to see if the motor ran too different. Didn't want to toast my alt or battery. What do you all think happened? Is this normal wear or is something not right?