Okay, so Joe and I took the plunge and bought two trucks for getting a mobile repair business going. Yesterday, we made the purchase, of a '93 3/4 ton service body and a '95 3/4 ton pickup, both with 5.8 liter engines. We had to service a few things to get us to the motel last night, but today, it's been nothing but problems and have only gone about 100 miles of a 340 mile distance. After the bad TPS and burst heater hose, this truck will get up to 70, then begin to falter, just almost stalling out, until you get back down to 40-45. My theorys are the fuel filter, which is fairly new, is now clogged, or something electronic is going on with the injector drivers. The TPS threw a 122 code this morning, along with a 512 for the Keep Alive power loss (both trucks sat for several years with the batts disconnected), but except for the 512, no code is throwing for the power loss. Of course, I don't own a scan tool, so I thought I'd toss this at you guys, see if I'm on the right track or not. It doesn't feel like an ignition problem, but it is possible it could be. Like I said, though, it feels like a fuel loss. What say you?