Q: Truck shut off while going down a hill

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My check engine light never goes off. When I go over 55 for a constant time the check engine light blinks. When coming down a hill towards a stop sign today the truck shut off and would not start back up. It's never stalled or sputtered before. All electronics still work and truck tries to start. Sounds like it is out of gas even though it is not. Wasn't sure if it was possibly a crank shaft sensor or fuel pump. Input is appreciated.

My car has 170000 miles.
My car has an automatic transmission.

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