The contact owns a 2008 Mercury Grand Marquis. While driving approximately 35 mph the contact began to depress the brake pedal to decelerate while approaching a traffic light. The vehicle suddenly accelerated on its own and there was an increase in the rpms. The failure occurred intermittently and over time became progressively worse. The vehicle was taken to the dealer for diagnostic testing. The technician was unable to diagnose the failure. The vehicle was not repaired. The approximate failure mileage was 63,000. Updated 10/4/11 the dealer stated the brake pedal was adjusted to high, which may have interfered with the accelerator pedal. They lowered the automatic brake pedal. Updated 10/24/11

- Summerfield, FL, USA