[hunter01]

Change the radiator cap to a stant cap, the originals are no good. After three years I would flush the cooling system and replace the coolant as well. Some will tell you to get rid of the dexcool however with a new rad cap you shouldn't have a problem, just remember never to mix the green anti freeze with dexcool. Check your air filter, this could cause loss of power. Check e-bay for a discounted cold air intake. At almost 50k miles It would be a good idea to change the tranny fluid and filter, front and rear differential fluids and transfer case fluid. Switch to synthetic for the diff fluids, the transfer case uses autotrack trans case fluid, a gm product.