I have a 2003 Sierra 1500, a couple times now at a stop sign when I go to start the truck goes nowhere. I put it in park and then back to drive and all is well. It shifts fine and I notice if I just barely give it gas from a start the transmission works fine. Any help would be appreciated. Thanks in advance. It has done this about 3 times. Truck has approx 360,000 miles.
