Fuel pump relay
If this happens every time you start your truck and it shuts off the same each time, you just might have a dirty fuel filter only allowing so much gas pass through until it clogs once again. I once had a chevy van, when I would drive it, would go a few miles and engine would shut down. I would wait 10 or 15 minutes, it would start up and allow me to drive a few more miles then shut down again. I changed the fuel filter, It was fine after that.
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