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The Texas greasmonkey has it right! Leave it alone. I put a BullyDog chip in my '04. Wow, it really boosted the speed and power but I do believe the turbo died from it. I put it back stock. Good...

The best thing to do is go to Ford dealerhip and have the service mech put it on the scope . This will get you the problem detected quickly. Don't you have a warranty on the truck? I've been using...