1997 chevy Silverado 5.7 ltr.
Had a  rebuilt transmission, new cylinder unit, Fuel pump.
Question: Truck is shutting down on me while driving. We were at Walmart and it died while pulling
out, then it died driving out of, then we got going up to speed and it was dieing and starting back
up by itself while i was on the highway.

So we pulled over and looked under the hood and didn't know what to look for so we just went on
home. It was like it was posessed or something.

I would appreciate it if you could give us some kind of idea what could be wrong with it. Thank you,  

This is a strange problem to have your Chevy Silverado die out at idle and while driving at speed.
Usually it is one or the other.

Stalling at low speeds in the parking lot is usually just
carbon in the throttle. That can be fixed with a
good cleaning using carb cleaner or SeaFoam. Then take for a drive on the highway to sort of blow it
out. But that would not explain stalling out and starting back up while driving. That could be a couple
different things.

If you are loosing all electrical power, it could be something as simple as a loose battery cable. Other
possibilities are a loose ground wire. A common one is on the back top of the passenger side of the
engine. It is a small black wire that bolts just behind the cylinder head against the firewall. If you can
find it, give it a little tug to see if it breaks.

Another common problem on this truck is a bad ignition switch. This is what the key goes into. It is
attached to the ignition key cylinder. The ignition switch feeds power to most of the truck electrical
system and can cause these problems. You can try to tap on the head of the key with a small
hammer, and just under the key on the bottom of the steering column with the vehicle running,
Sometimes this will cause a faulty switch to act up and make the truck stall out.
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1997 Chevy Silverado Stalls And Start Back Up