ERmmm. Why are some pink and some not? On the electrode shroud. You got pink coolant by any chance? Looks vaguely familiar to a 3.8 with a bad head gasket.
on second look, I would put money on that. Bad head gasket, you can see the whitish pink buildup on some plugs. Labor intensive, but you can get it done under 250 if you do it yourself. Get the heads planed before you do the new gasket. Msg me if you need more help/pointers.