Sounds like a classic CPS problem. Age doesn't matter, I have seen them go in 10 miles or last 300K. It should have set a code, have you scanned for codes? You should have a spare CPS , all 7.3 owners should, throw it in there and see what happens. Check UVC harnesses and verify fuel pressure when key on and drain valve open. If al of this checks out I would want to monitir ICP pressure and fuel pressure while cranking and you will need the AE software for that.
Here's what I have for codes. Keep in mind, though, I had to enter it as an '00, because I only have software for the MT2500 up to '00. I'm not sure if it's going to make a difference, but here goes:
P1249 Wastegate CTRL valve perform
P1670 EF feedback signal not detected
P0603 Internal CTRL module KAM error
P1316 IDM codes detected
P0478 Exhaust pres CTRL valve high
P1211 ICP above/below desired(this code is probably from the TW)
P1277 Cyl 7 (c) high to low side open
I also changed the ICP & CPS before I scanned for codes. After the install, it's doing the same thing.
"HEAVY" 2001 F-250 XLT 4x4 EC SB
TW 6pos chip, S&B CAI, Monster 4" exhaust w/ Power Elbow, Big Head WGA, Technicooler, ITP boost fooler, Gen 1 Wicked Wheel, Six-Gun Tuner, Optima Yellow Tops, AutoMeter(Boost, Trans, EGT), CCV mod, MTS TC, MTS valve body, Trans Tech performance rebuild kit, TransGo shift kit, Hornblasters 242 Shocker Train Horns.