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When it is next starting sluggishly, loosen the serpentine belt(s) just to make sure that an idler or the AC isn't seizing.
If it is still sluggish with a loose belt, remove the starter and put it on the bench. Give it 12V. If it doesn't spin properly, dispose of it and install a 6.4 starter. If it does spin properly, dispose of it and install a 6.4 starter.
That's kind of a joke. ...but only kind of.
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