I put my old Motorcraft ones back in after running +4's for three years -- The Motorcraft seem to work better in my car. The power band seems to be smoother and the detonation I was experiencing as the secondaries opened seems to be gone. The +4's appeared to be in relatively good shape.
What's interesting is that the center electrode's one the plugs from the front bank are the ones that are worn -- the rears look brand new. I thought the coil pack design was supposed to wear the rears faster? Am I remembering wrong?
-Lance
