Vehicle Shudder problems of the 2007 Mercedes Benz R350

The contact owns a 2007 mercedes-benz R350. While driving 35 mph, the vehicle began to vibrate. While shifting gears, the vehicle violently lunged forward without warning. The accelerator pedal was engaged with force; however, the vehicle failed to accelerate. The failure recurred numerous times. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was 138,000.