Q: my car moves very well ,after driving for about an hour the car sudenly slow down with my leg on the thrutlle pedal ,the car slow

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my car moves very well ,after driving for about an hour the car suddenly slow down with my leg on the thrutlle pedal ,the car slow and start moving after a while ,this is very frustrating,I have change some fairly used fuel pump it work for a while and the problem continue

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

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