COMING TO A STOP APPROX 2 MPH THE ENGINE SUDDENLY REVVED VERY LOUDLY AND THE TRUCK SHOW FORWARD. THE BRAKES DID NOT STOP THE TRUCK. I SWERVED TO AVOID THE CAMPSITE WE WERE AT AND HIT A TREE VERY HARD. THE ENGINE HOWEVER CONTINUED TO REV LOUDLY AND I SHIFTED TO PARK. WITH THE ENGINE STILL VERY LOUD AND THE WHEELS SPINNING I HAD TO SHUT THE ENGINE BY REMOVING THE KEY. *TR