TL*THE CONTACT OWNS A 2007 FORD EXPEDITION. WHILE DECELERATING AT 5 MPH, THE ENGINE REVVED WHEN THE BRAKE PEDAL WAS DEPRESSED. AS A RESULT, THE CONTACT REAR ENDED ANOTHER VEHICLE. A POLICE REPORT WAS FILED. THE DEALER WAS UNABLE TO DETERMINE THE CAUSE OF FAILURE. THE VEHICLE HAS NOT BEEN REPAIRED. THE CURRENT AND FAILURE MILEAGES WERE 1,000.