My dad's truck is having a similar issue the truck will start but won't stay on more than a few seconds when we hit the throttle it doesn't do anything but the fuel pump is responding we can hear it i

Is check engine light on? If so what are the codes?

No light no code

We've tried checking plugs and wires timing belt fuel pump and the fuel filter was just changed not long ago

My 2007 quad cab 5.7 hemi was doing something similar but not all the time. It ended up being the egr valve getting stuck open. Replaced it and all is well now. But not sure if that's your issue.

Ok thanks we finally got a computer and have 4 codes a po 700, po732,po734,po700 with an arrow going up and down

http://www.obd-codes.com/p0700

P0732 Gear 2 Incorrect ratio ---- P0734 Gear 4 Incorrect ratio

Try unhooking the battery for about ten minutes. This will clear all codes and truck might go back to operating properly. If not the codes will reappear.

The only problem with unhooking the battery is that it has an electronic throttle body, and if the electronic throttle body isnt the problem to begin with, it will be when you unhook the battery..

Cha ge the battery on key. Mine was doing the same thing till i changed the battery on the key

Check for codes and also check ur starting system u may have a bad alternator causing to die. Unless it starts right back up and dies when druvinflg I would think bbn ut would be the crank shaft sensor or cam sensor.