Take it to a shop and let a real shop diagnose the code for ya. If you went to AZ and had the code pulled it dosent help you get the diagnostic stratagy to fix it. You can get a manual on the truck and see if there is a diagnostic tree in there to help you fix it.
SCT Tuner - 400.00
Jaws Racing Tunes - 150.00
Beating the wifes new GM truck - Priceless http://www.jawsracing.net/