I might be at the wrong site but I need some advice. I am a newbie to VCM and I have a 97 k1500 I was thinking of buying the odb II software from Alex Peppers site. Right now I have a P0420 code that I want to diagnose and I think that his software will help me along the way. I was hoping you guys might let me know if I am going in the right direction or basically tell me if that software is going to monitor all the values I need to find my problem. Because I don’t want to replace my cat and still have a problem. I know something else is wrong the truck is a little sluggish and has a small miss at idle.

Thanks for the help guys,
Richard

P.S. maybe I will learn enough trying to fix my problem that I may want to adjust a few things…