2000 E-350 5.4 Ignition Missing Under Load

[hutchinaugusta]

I just bought a 2000 F350 Econoline 5.4 liter auto, the engine runs good @ idle and under light loads, but under a medium or heavy load it begins to break up, like a carberated engine that is cold, you ease off the accelerator and it runs smooth again and stops skipping/missing, you continue to push to accelerator and it does kick down or unlocks the TC so the TPS is working??

[matthassey]

had that problem on my 250 5.4 ended up being 2 coil packs