The vehicle has a drive-by-wire accelerator.
This means that instead of having a throttle cable between the accelerator pedal and the throttle body, the accelerator pedal position sensor,
sends a signal to the computer, and the computer operates the electronic throttle body.
Try this.
Turn the ignition switch on. Slowly press the accelerator pedal to the floor, and slowly let the accelerator pedal up. Shut the ignition off.
Now drive the vehicle and see if the accelerator is more responsive.
Tester