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Hi everyone - I hope one of you will have a suggestion for me. I have an 03 F250 (automatic) 6.0L. I'm getting an engine vibration when the transmission shifts into the highest gear and I try to maintain my speed or accelerate. It feels like one or two cylinders are not firing properly causing an in-balance. I also noticed that if I push the "tow / haul" button, and keep the RPMs between 2k and 3k, the vibration is there, but harder to notice. I am not getting any engine failure codes at all. When I got home, I also noticed the truck was leaking some diesel onto the ground. The leaking only seems to happen when the engine is running.
Last, I don't know if this is related or not, but the problem started immediatly after both fuel filters were replaced by a gas station mechanic. (I was away from home and this needed to be done)
Last edited by call4jr; 01-02-2013 at 12:44 PM.
Reason: added - no engine codes