Do not, repeat do not purchase aftermarket plug wires if you have a
3.4 DIS V6. I replaced mine probably a year ago with a CarQuest set. Yesterday, I went to change the plugs and every one of the terminals that contact the spark plug tip pulled loose from from wire and remained on the plug. Buried six inches down in the center of the valve cover! Much cussing and fumbling with needlenose pliers got the terminals off.
So....I bought factory wires and here's the real kick in the head - the factory wires are some $10 cheaper than the aftermarket set! Far and away better quality as well. In the mid $50 range. I know that's a lot for 3 plug wires though.
Now the question. All of the plus looked clean with the exception of the one closest to the firewall on the passenger side. The ceramic insulator on that one had a slight brownish red discoloration. Any ideas?