The only thing that can be done is to go to the dealer and they can "flash" it to the original specs of your vehicle. That has to be done at the dealer.
Rowefast is correct about the dealers reflashing the system. But after that you can buy a unit like Bully Dog or HyperTech and make additional adjustments, if that is what your looking for.
Where is the computer located at, I was able to get another one
Odd usually they can't get one one without the numbers off the old unit. Go to: https://www.2carpros.com/questions/2002-chevrolet- malibu-computer-chev