1996 Cadillac EL Dorado throtle pedal sticking

My fathers car, last year same time fuel pedal stuck on him driving to visit a friend, luckly he pulled off the road and stopped it from pulling him on, now he says he cracked throtle few times and did not idle down, shut car off and tryed again same thing engine runnin very high, shut off and let it sit till later that evening, when I got a chance to look at it, car started right up and had no issues, I looked at the throtle cable, return spring, fuel pedal, all looked ok, lubed everything up just to make sure, now year later same thing happened, any defects from cadilac I should know about, any possible wire or cumputer malfuntions ya think, let me know, thankyou much!