I WAS DRIVING ON A STATE HIGHWAY WITH NOWHERE TO PULL SAFELY OFF THE ROAD WHEN THE THROTTLE BODY FAILED. THIS FAILURE CAUSED THE ENGINE CONTROL COMPUTER TO SET THE ENGINE TO "REDUCED POWER MODE" WHERE I COULD NOT DRIVE THE CAR PAST 20 MPH WITH THE ENGINE BARELY RUNNING. I HAD TO DRIVE THE VEHICLE FOR ABOUT 1/2 MILE IN THIS CONDITION BEFORE I COULD GET THE CAR OFF THE ROAD. THIS HAPPENED ON A DARK WINDING STRETCH OF ROAD WHERE TRAFFIC NORMALLY MOVES AT AROUND 45 MPH SO THERE WAS A SIGNIFICANT POTENTIAL FOR A REAR END COLLISION WITH A CAR SPEEDING UP BEHIND ME. *TR