Just bought an '03 7.3 F250 with 67,000 miles..guy just put on a new alternator, 2 new batteries, new starter, new fuel filter and new fuel pump. Drove the truck about 100 miles, no problems. Went on a 260 mile round trip this weekend and about 140 miles into the trip, punched the truck down to get on the freeway. Everything worked good until about 60 mph, then truck died down. Let off the pedal, eased back into it and the truck ran good...punch it down and shortly after turbo kicks in, the truck starts to die down/lose power. The turbo seems to be working okay. The guy said the truck sat for 2 years before I bought it. I think I see a bit of algae on the fuel filter and the filter is new. Any thoughts/suggestions?