Will running E85 help with spark plug change?
Truth. The only things I'll add are be PATIENT and and use the "loosen-tighten-loosen" technique, or what I call "two steps forward-one step back" method.
hopefully you changed your oil afterwards also....
The only plugs that are different are for the redesigned heads, which an 06 does not have. The new heads did not come out till mid-08 model year. Even with the redesigned heads, the plugs are the same for the regular and FFV engines. Starting in the 09 model year, all 5.4's are FFV. The plugs for the redesigned heads are SP-509's.





