Sorta. GM has an updated PROM (programmed Read Only emory) chip for that car. I would bet there is an updated one you can install for a surge or rolling Idle. They used to cost 45 bucks. It installes inside the ECM . Not sure if one is still available for your IROC. Go to see the general (General motors) at least they may be able to help you.
You can erase it with ultraviolet light , but retuning it may prove to be tedious.
It will have some numbers and letters on it. That tells the calibration, from there the GM counterguy, if he is worth his salt can look to see if it has been upgraded. ( I would bet money that it has.)
Howell engine development has them for about 250 bucks.
Fact is stranger than Fiction