THE VEHICLE WAS GOING DOWN A HILL (STRAIGHT FORWARD) ON A CA CITY STREET WHEN THE DRIVER SHIFTED FROM AUTO TO MANUAL GEAR. INSTEAD OF WORKING AS EXPECTED, THE CAR UNDERWENT A SUDDEN ACCELERATION AND BRAKING PROVED INEFFECTIVE. THROUGH A COUPLE SECONDS OF ATTEMPTED BRAKING WITH NO RESPONSE, THE CAR KEPT ON ACCELERATING INSTEAD. FINALLY, AFTER MAKING TWO TURNS ON THE HILL, THE CAR SPUN COMPLETELY OUT OF CONTROL AND SWERVED TO THE OTHER SIDE OF THE STREET WHERE IT CRASHED THROUGH FIVE TREES AND EVENTUALLY STOPPED. THE DRIVER LOSS OF CONSCIOUSNESS AND DELIVERED TO ER. THE WEATHER CONDITION WAS GOOD. THE FAILURE MILEAGE WAS 79,541. POLICY REPORT FILED.