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I have the same problem on my '03. Turbo was cleaned just over a year ago. Check for exhaust leaks on your turbo up-pipe and the Y-pipe collector. The flex joints on these parts are notorious for cracking and leaking on the 6.0's causeing boost/lag issues. Just got my parts in the mail to fix mine. Fingers crossed that my truck wakes up after this project is done. Also, one exhaust manifold bolt on the passenger side was broken as well, causing a small leak. I'm gonna remove the manifold and install new bolts/gasket to that side. May want to check your manifolds as well.
SOLD--2003 F-250 RC/LB FX4, 6.0, 5R110, EGR cooler capped off at both ends, CAT EC-1, Rotella T6, Motorcraft fuel and oil filters, Amsoil in diffs/T-case, blue spring update, ScanGuage II, 5" Diamond Eye exhaust (not cat, no muffler
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) 4" downpipe, Cooper Discoverer S/T's (LT265/75R16E).