crank shaft

I am new to the group so first I would like to say hello to everyone. I just got back from hooking up my 2004 GMC Envoy XL to the computer reader at Checker. I got a few codes and I think I may know what they are but I thought I would post them here to be sure. I am making a trip from Colorado...

I am new to the group so first I would like to say hello to everyone. I just got back from hooking up my 2004 GMC Envoy XL 6CYL to the computer reader at Checker. I got a few codes and I think I may know what they are but I thought I would post them here to be sure. I am making a trip from...