UPON ACCELERATING IN REVERSE, MY CAR SHOT BACK AND HIT A TREE 13 FEET FROM MY BACK FENDER. IT WAS AFTER NOTICING THAT MY EXHAUST SYSTEM MIGHT POSSIBLY BE DAMAGED THAT I PROCEEDED TO GET INTO THE CAR TO GENTLY PULL THE CAR AWAY FROM THE TREE AND UPON PUTTING THE GEAR INTO DRIVE FROM PARK, MY CAR THEN SHOT FORWARD AT APPROX. 40 MPH. I WAS TOLD BY THE MECHANIC - GREG FIELDS AT BILL PAGE TOYOTA THAT I HAD A STICKY THROTTLE PLATE, AND THAT IS WHY MY CAR JUTTED FORWARD. ALTHOUGH HE RECOMMENDS THAT IT BE CLEANED EVERY 30,000 MILES DUE TO THE OXYGENATED GAS THAT IS SOLD IN THIS STATE, THUS RESULTING IN A DIRTY THROTTLE PLATE- OR ACCELERATOR PLATE, THIS IS NOT WRITTEN AS A REGULAR MAINTENENCE PROCEEDURE IN OUR 1992 TOYOTA OWNER'S MANUAL. THE BODILY INJURY THAT COULD HAVE OCCURRED BY THIS OOUT OF CONTROL CAR COULD HAVE BEEN ASTRONOMICAL. THE YOUNG SU. *AK