Q: Keeps shutting off!

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One day my car wouldn't start so I got a jump and that didn't work so I had it towed to a shop the mechanic told me it was the fuel pump so he fixed it and gave me an oil change. I was driving the car home from the shop and less than 10mins into the drive the car starts to slow down and come to a stop (shutting off)I noticed the key light was on so I immediately called the mechanic he told me he programmed a new key to my car (without my knowledge) because my old key is what caused the fuel pump to go bad! after waiting a hour the key light went off and the car started back up so I drove it back to the shop the next day he said its the computer system and only the dealership can fix it! Since then the car starts up sometimes if the key light dnt come on. So yesterday I started the car up with the old key and the key light never came on and the car ran for abt 30mins but it cut off again! I asked the mechanic was it the alternator but he said no however, he never tested the alternator

My car has 160000 miles.
My car has an automatic transmission.

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