Q: ECU ? 2006 Mazda 6

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I am going to buy a Mazda 6 2006 but the guy told me it won't go over 20 mph and that the reason is because the ECU is fried. it also needs a spark plug in cylinder 5. I don't know much about cars so I wanted to know if by getting a new ECU and a new spark plug. Will the car run good again? That's what the guy told me that was needed to be done.

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

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