My truck scared the bejesus out of me yesterday! I was on the highway and hit the throttle to speed up to pass a car. When I let off the gas, the truck continue to accelerate for a couple of seconds. It surprised me so much, I press the brakes a little. I accelerated again to duplicate what happened, and sure enough.....it did it again. When I was down the street from my house, i mashed the gas to pass another car.......it did it again! This time I had to slam on brakes, because another car wasn't too far in front of me. It does not do it during slow or moderate acceleration; only during hard acceleration and the truck has to down shift. Does anyone any idea what's going on with my truck? If so, is it an easy fix before I take it to the stealership or mechanic?