My recommendation is to follow the same procedure as you’d follow in any car when the throttle sticks:
- Put the transmission in neutral.
- Pull over.
- Put it in park.
- Shut off the engine.
I had my mother practice this procedure a couple times so she would know what to do with her Toyota if the throttle got stuck.
Shutting off the engine should always be the last step so you still have power to all the systems, like steering and brakes. Let the engine rev and scream all it wants. It likely has a rev limiter and your life is worth more than an engine anyway.