Most likely a plugged fuel filter, likely due to a bit of water in the fuel tank.
Ethanol-added gasoline actually sucks water out of the air into the fuel.
As you drive, the water molecules actually start to plug the filter, and starve the truck out and it dies. As it sits, the water falls off the filter material and it will start and run again until it simply does the same thing again.
A simple $10 fixya!
(throw a couple of bottles of "Fuel Dryer" into the tank, too. WalMart cheap stuff works as well as any of the others. It is actually just ethanol, too - but the extra amount of it helps emulsify any reamining water in the tank and allows it to pass through the (new, fresh) fuel filter)
Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting and let me know if you have questions.
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