WHILE TRAVELING ALONG A 4-LANE STREET, THE GAS PEDAL WENT TO FULL THROTTLE, VEHICLE ACCELERATED FROM 50 MPH TO PASS A BUS. ENGINE WAS THEN TURNED OFF, CAUSING A LOSS OF POWER STEERING. UNABLE TO STEER, VEHICLE BRUSHED UP AGAINST ANOTHER VEHICLE , WENT UP ON CENTER OF MEDIAN AND STOPPED WHEN IT HIT A SIGN POST.*AK