WHILE DRIVING THE VEHICLE THE PLASTIC BLOCK THAT CONNECTS THE THROTTLE VALVE (TV) CABLE TO THE THROTTLE LEVER BROKE WHERE IT CONNECTS TO THE THROTTLE LEVER. THE PLASTIC BLOCK, STILL CONNECTED TO THE TV CABLE, DROPPED DOWN AND WEDGED BETWEEN THE THROTTLE LEVER AND A FUEL RAIL AND PREVENTED THE THROTTLE LEVEL FROM GOING BACK TO THE NORMAL IDLE POSITION. WHEN APPROCHING STOPPED TRAFFIC AT AN INTERSECTION THE PARTIALLY OPEN THROTTLE PREVENTED THE VEHICLE FROM STOPPING AS USUAL AND A COLLISION RESULTED. WHEN RESTARTING THE VEHICLE AFTER THE ACCIDENT THE ENGINE IDLED AT 3000 RPM. WHEN THE PLASTIC TV CABLE BLOCK WAS UNWEDGED FROM BETWEEN THE THROTTLE LEVER AND THE FUEL RAIL THE ENGINE IDLE SPEED WAS BACK TO THE NORMAL 900 RPM.