You'll need it for the 2002. Check out LS1Tech.com's HPTuner section. There are a lot of guys in there that will help teach you how to use the new software. I'd go back to who you bought the PCM tune from and have him fix what he broke. They have got to learn to do it right the first time or eat the cost of sending you another one to make it right, gratis. I wouldn't let up until you got what you paid for.