I have a 2015 GMC Sierra 1500 5.3 V8, been having issues lately with what seems to be shifting and gears wise. Started off riding really rough when shifting from V4 to V8 while accelerating, now this morning I left for work and came to the neighborhood stop sign and it completely stopped moving while in Drive, hitting accelerator the truck did not budge, still running and will shift into different gears but just won't move! No Dash lights have popped on at all. Help please!
