Fine. Do that. Just make sure it's a Mercedes Dealer because only rarely will you encounter anyone at a Chrysler dealership that knows ANYTHING about these cars.

To do a throttle reset:

Get in the car.
Turn the key to "ON" but don't start the car, press pedal to the floor and hold it there for over 5 seconds.
Keeping the pedal to the floor, turn the key off. Now, you can release the pedal.
Sit there for at least two minutes without starting the car or turning the key on.

That should do it.