Let off the throttle all the way and downshift into 2nd gear and get ready to use the emergency brake when needed to complete the stop.
'I'm glad you and the car were not hurt or injured: up:
I went through a 6 ft. tall chain link fence at work when my old 1963 Plymouth M.W. car throttle stuck at WOT while goofing around driving it into our work yard one morning due to the left rear wheel cylinder failing when I jump on the brakes hard to try and stop it.
I'm glad that didn't tear the car up more than it did, it tore the 426 hood emblem off and scratched the front of the hood and roof above the windshield, not good.
That incident scared the keck out of me and made me think a lot more after that before doing stupid things in a car with some power work: