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Q: how do you change the engine control computer? on 1998 Chevrolet Venture

looking up the computer online it say that there is onboard programing after installation. is this something that come with instruction so i can do it myself or do i have to take it to a machanic?
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When you buy a new or reman PCM it does have to be flashed for your vehicle. Contact me at I know of an alternative.
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