Yeah if the key has a lil microchip in it, then it could be faulty and not sending the correct signal to the computer.

A friend of mine has a Camaro and it was doing the same thing you're describing. We replaced the ignition switch, the key cylinder, the battery, the TPS, the fuel filter, and the clutch bypass switch (it's a 5 spd) before we narrowed it down to some $3 resistor. I can't remember exactly where it was, I'll ask him tomorrow and get back to you.

 

When we try to start the truck, you can hear the fuel pump and then it shuts off. It is probably something so dumb, I hope.

There is no chip in the key.

 

Ok, if your getting fuel and your getting spark it should fire and run. The only other thing you need is air, and I seriously doubt your not getting that. Although it is possible something built a nest in your intake.

Your first post mentioned removing an alarm, was this an aftermarket alram system? Aftermarket alram systems are notorious for draining batteries dead. Teh stock security system on the other hand is only activated when you try to start the truck. Reason I ask about the after market system is maybe one of the wires associated with it has come apart or something.

Just because the fule pump is coming on doesn't mean your getting fuel. Test it with a gas pressure tester. Like $35 bucks unless you know someone with one. Or disconnect the fuel filter and see if your getting fuel. Careful gas will shoot everywhere, you'll know if it is working. And your sure you have gas in the tank right??????

Short little story.
During my last 4wheeling trip the gentlemen who spansored the event (45 trucks) couldn't get his truck to run. About 8 of his closest drinking buddies helped him swap ignition systems, change fluids, test everything. They spent almost the entire night drinking and working on his truck to get it running for the nexts days activities. Turns out he was out of gas.

 

Been along time since I posted, but had a mechanic look at it.
Apparently, it seems the truck was stolen before I bought. Some of the wires in the harness in the steering column were taped together with wire tape. Mechanic stated I was lucky because the wires were somehow going to trigger the air bag to go off. When we first purchased the truck, the rear hatch was sealed shut and we couldn't figure out why. We put the pieces together, and from what we pieced together it seems the theif broke through the rear hatch and stole the truck. The owner didn't want it happening again so he sealed the hatch. I don't know but it makes sense. Wires cut in steering column, rear hatch sealed....

Thanks for everyone's input.