I have a 2005 GMC Sierra that I swapped the original 5.3 for a 6.0. I also had a Brian Tooley Truck Norris cam installed with Speed Engineering long tube headers and Y-pipe, I am having the problem with the truck idling. It will not stay crank parked or when I come to a stop. I am a newbie, as this is my first attempt at tuning. I value and appreciate any advice please help.