Accelerator Stuck problems of the 2017 GMC Sierra 2500

Traveling I-81 s in maryland, approximately mile 290, accelerator stuck in full throttle. I had accelerated to pass a car, but the accelerator went to full throttle, and stuck on full acceleration. I stayed in the left lane, applied brakes sporadically to limit the increased speed, and quickly hit the accelerator pedal with my foot and immediately released several times to try to "break" the accelerator free. I did this multiple times with no results until finally, when we were at 94 mph, the accelerator broke free, and disengaged. The brakes smelled strongly from the efforts to retain the acceleration. The truck had approximately 2,300 miles on it when this occurred. I had planned to put the truck in neutral and move off the road before we hit 100 mph. If my husband had been driving, he might have turned off the car and lost control (due to loss of power). This was extremely troubling, and extremely dangerous. Thankfully, traffic was limited enough not to cause a worse outcome. I contacted my dealer and the dealer where I was traveling to.