What should you do if your accelerator sticks at high speed?

When faced with a situation where your accelerator sticks at high speed, the most appropriate action is to give the pedal several sharp taps. This method can help to dislodge the stuck accelerator. Tapping the pedal quickly may allow the mechanism to release and restore normal function, which is crucial for your safety and control of the vehicle.

Shifting to park is not advisable for vehicles in motion, especially at high speeds, as it can lead to loss of control and can cause the transmission to be damaged. Ignoring the accelerator and continuing to drive can lead to dangerous situations, as you won't be able to slow down or stop as needed. Turning off the engine immediately while driving at high speeds can cause the loss of power steering and braking, significantly increasing the risks involved.

Thus, giving the pedal several sharp taps is the best initial response, allowing you to attempt to regain control of the vehicle safely.