I have a 2003 f250 with a 5.4 in it. I have been having this problem for about a month now, and it's not every time I run it. I'll start the truck and it'll run rough, as if it's not firing on all 8 cylinders. It'll run like that for a short bit, then it'll start to run smooth then back to rough, then it'll finally smooth out and run like a ford should. Any one with ideas with what's wrong, please share!!