I might as well replace the cap then. Today I noticed a "click" "click: noise when I raised the hood and noticed it was coming from the #1 spark plug wire. As I pulled it while it was running, I saw it was arcing to the manifold. I placed it back on and repositioned it so it wouldn't arc anymore but maybe I need to replace the plug wires now along with the cap? I don't know how old they are. Do I need to get special MB plug wires?