bought a 2001 250 7.3 with 89000 miles and the truck had been sitting with occasional start ups for about 8 years. Needed IPR to start and drive away. Loss of power when under load. I have replaced in order, IPR, ICP, HPFP, fuel filter, oil filter, air filter, batteries, alternator cam shaft position sensor, contribution tests show low cont on 1,3 and 8. Truck will idle np but not move for long under its own power. Don't want to keep just throwing money at this thing I just want to fix it. Any help please!!!!!!!