You're not by chance the guy Ramsmoker was telling us about yesterday are you? At any rate, that sucks. Read the link Rodslinger posted, I put up a response about a buddy who went through about the same thing and ended up with Banks proving that their parts were not the cause and Ford paid the bill. To me, if its a known problem, they should have had a recall. Knowing that your rig has aftermarket parts on it gives them an easy cop out on eating the bill. Don't give up, Ramsmoker will give you some great advise! Good luck and keep us informed.