Gas pedal sticking

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Driving and attempt to pass a car on open highway, drivng at40 mph, stomped on gas pedal and gas pedal stuck, drove for 1/4 to 1/2 mile at 80 mph, realized could not descend when let off pedal. Tried pumping brake, kept accelerating down a grade. slammed foot on gas pedal several times, finally gas pedal returned to normal and had control of it.