I was told that mustangs have a tendency to misfire if you don't use motorcraft plugs, what plugs do you guys use and do you have any problems with non motorcraft?
I am still running on the platinum plugs that came stock, except two COPs had to be replaced (it was in the service records). I have 62k on it, I am thinking about changing the plugs but I have a long list of things to do before I go about doing it.
does anyone run NGK's? i've always had good luck with them in my sportbike, not sure if they make them for the 4.6, but they mite. i just haven't looked into it.
I use NGK's. They are 2 steps colder than stock. No problems. I had some side-gapped autolite 764's in before and I lost 4 rwhp down low but gained 6 rwhp up top. I don't have the graph with me tho.
well, I get my Motorcraft plugs for free but they don't have enuff coverage for my appt, so I use Champion #281/S63YC which is a race plug wth projected tip