OK, I finally got all of the wires out, which was a biyatch. I pulled out the first plug and it is the same Motorcraft I just bought. The plug is still in good shape. So, my question is; how often do you replace the plugs? I'm at ~45,xxx miles and they are in good shape, just dirty. Should I clean them and throw them back in or should I go on and put in the new ones?
