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sorry I can't help, but I had a 2001 Supercrew with a 5.4L and it did the same thing, it would have a terrible miss getting up to speed, sometimes really bad sometimes not at all. the were no codes stored in the computer, I eventually changed the fuel filter, cleaned the throttle body, and changed the plugs and coil packs, and the problem seemed to go away for a while but definatly did come back jsut as bad as before. I sold the truck before I ever resolved the problem, but boy did it drive me nuts trying to diagnose it.
I;m curious to find out the cause of your problem....
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late '99 F-350 Lariet, CC, LWB, 4x4, Auto, leather, Off-Road: 4" Flo-Pro exhaust, 6637 air filter, foil delete, CCV mod, Autometer Sport Comp gauges, Sonnax/Tri-spring kit, DP Tuner stock/80/120, 4" custom lift, 315/75R16 ProComp AT's on 16x10 ProComp 1079's, 04 headlights, Sirius sat. radio
previous trucks:
early '99 F-250 PSD 4x4 6-speed, stacks, lift, gears, etc
1997 F-350 PSD 4x4, 4" lift
TRUCK PICS
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