Why does the accelerator of a car open by itself?

If it is a zipper, it may be that the zipper is too long, the accelerator is stuck, or the effective stroke of the accelerator pedal is shortened! The other is the electronic throttle, which can also be divided into several situations! It is possible that the original car is like this, and the computer version of the data is maximized to protect the engine! Also, if you just start and don't walk, then the throttle won't be fully opened, because the full-open engine rotates too fast and wears quickly! There is also a fault in the throttle motor, or a pedal slip fault, or the throttle is stuck!