I had a similar issue with my 2005 6.0L diesel. It felt like it wanted to go, but just couldn't. changed every filter and also had ford check the EGR and the intake, all checked out. Then I decided to remove my cat and just inspect it....junk all clogged up. So i took it off and put a piece of 3.5" pipe there, now the truck goes unreal!
CLOGGED AIR FILTER .LOOK FOR LEAKS IN THE DUCT THAT JOINS THE TURBO COMPRESSOR OUTLET TO THE INTAKE MANIFOLD AN INTAKE MANIFOLD GASKET LEAK OR OBSTRUCTION IN THE EXHAUST SYSTEM . CHECK WASTE GATE LEAKS CAUSED BY ACCUMULATION OF CARBON AROUND WASTE GATE . OR A WEAK OR BROKEN RETURN SPRING . ON WASTE GATE.
May be a bad fuel filter or pump.
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ive checked every filter, and they were all good. it doesnt boost untill it gets to like 3rd gear,then it boost like 15 psi
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