The electrical switch is called the "kickdown" switch or "wot" in old terms
Under the drivers seat parallel to the brake pedal.
That one is self explanatory it is the pedal(Gas and Brake) button it adjust it like the automatic buttons for the drivers seats.
Possibly kickdown button located under the 'gas' pedal is stuck in the down position.
That would be the gas pedal. Located just right of the (Stop Inertia) button, or the brake.
Broken or disconnnected cable, something stuck under pedal,
Key on, engine off. (if push button start, press button twice without touching brake) press gas pedal to the floor three times.Key on, engine off. (if push button start, press button twice without touching brake) press gas pedal to the floor three times.
It actually a button located on the floor under the accelerator pedal. Consider it a "turbo" button. It kicks your Benz into high gear and drinks all your gas.. but your car will move like a rocket.. pretty cool!
To the right of your gas pedal under the dash
under dash above gas pedal
if you got an automatic transmission you may have to get a kick down linkage so your transmission will down shift if it needs to when you give it gas that is only if there is not a button on the floor under your gas pedal if there is you dont need one the button does the same thing the cable does
Its going to be under the dash beside the gas pedal
under dash above gas pedal