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IMHO, a performance problem with no codes that is temperature-independent is either:
a) Clogged catalytic converter
b) IPR valve wiring or the valve itself
You have replaced the fuel filters and pump so - although that doesn't rule fuel out, it rules it out for the moment.
So, questions... 1) Have a cat? 2) Have you tried moving the IPR valve wiring around - or any wiring - while idling to see of you can produce a stutter.
Last question... 3) Are you sure that this is speed-related and not temperature-related? Gotta ask.
2004 F550 CC Lariat
BPD oil cooler relocation and upgraded EGR cooler (spooled), BPD oil bypass filtration, aFe Magnum Force CAI, Mishi radiator, 7.3L fan clutch, EC1 ELC, XDP coolant bypass filtration, '08 trans pan/filter, PTP direct clutch solenoid, blue spring, 6.4 starter, MBRP y-pipe, BD boots/clamps, '05 intake elbow, ccv reroute, Torque Pro + OBDLinkô LX, Autometer EGT