I DROVE UP HILL, SLOWED, TURNED, AND PULLED BEHIND TRUCK TO PARK OFF THE SIDE OF THE ROAD. THIS WAS ALSO UPHILL. THE CAR WAS STOPPED, I WENT TO PUT MY FOOT ON THE BRAKE TO SHIFT INTO PARK, AND THE CAR FOR SOME REASON ACCELERATED WILDLY (LOUD ROARING OF ENGINE). IT THEN LURCHED FORWARD VERY FAST AND SLAMMED INTO THE TRUCK THAT WAS IN FRONT OF ME. I HAD NO POWER TO STOP IT. THIS INCIDENT WAS COMPLETELY OUT OF MY CONTROL. I HAVE HAD PROBLEMS IN THE PAST WITH THIS VEHICLE WITH SEVERE HESITATION. I HAVE ALSO HAD A HESITATION, FOLLOWED BY EXTREME ACCELERATION. I DID FILE A COMPLAINT PREVIOUSLY. THIS IS A VERY DANGEROUS CONDITION. IT COULD HAVE BEEN A CHILD I HIT INSTEAD OF A TRUCK!. THE DEALER SAYS THEY CAN'T FIND A PROBLEM WITH MY CAR. THIS IS A SPORADIC OCCURRENCE, BUT IT SHOULDN'T HAPPEN AT ALL. *NM