I've got an '89 F250 with a fuel injected 351 that won't start. Over the last few weeks I noticed that it had started to back fire a little bit while I was driving it on occasion. Nothing extreme, I just kind of dismissed it because its just an older truck, but while I was driving down the highway it started "sputtering" (kind of like an idi does when there's air in the fuel, or like it was running out of gas) and then it died. I tried to restart it but it wouldn't fire up, so before I quit rolling I dropped the clutch in gear and managed to start it that way and limp it home, fighting it the whole way. I shut it off in the driveway and haven't been able to get it started since. It's got a new fuel pump, altenator, and battery and it turns over like a champ. I've cycled the fuel pump by turning the key while depressing the schrader valve and fuel squirts out so I know its gettinq fuel to the motor, but it doesn't even try to fire. I even tried a ether-ing it but still nothing. Any ideas on why this pile won't run? I'd appreciate any insight I can get before I start having to guess and shell out money for parts I may not need.