Accelerator Stuck problems of the 1997 GMC Sierra

My throttle plate broke. I was driving down a county road, I let off the accelerator and my truck continued to accelerate to uncontrollable speeds of 75 m. P. H. I then pulled over immediately to check to make sure my accelerator pedal was not stuck somehow. I started my engine and it idled a little higher than normal at about 2000 r. P. M. 's. I didnt think too much of it and started home. By the time I was at my house I could barely control my truck, and was not able to push in the clutch because the engline flew to over 3700 r. P. M. 's if I did so. When I got home, I called a tow service and had it towed to a mechanic. He said my throttle plate had broke which he had never seen before and said I was very lucky to be alive, much less have an engine. He fixed it for $510.