I TURNED ON THE SWITCH OF MY 1994 E320 MERCEDES NOTICED SMOKE COMING FROM UNDER HOOD ON PASSENGER SIDE. OPENED HOOD IT WAS ON FIRE. AIR FLOW SENSOR HAD JUST BEEN REPLACED. I HAVE SINCE REPLACED WIRING HARNESS, PLUGS, BUT CAR IS STILL SURGING NOT IDLING PROPERLY. REPLACED INTAKE AIR SENSOR, PLANNING TO REPLACE IDLE ACTUATOR, AND OVP RELAY. 153,000 MILES I HAVE SPENT 3000.00. MY SON WAS PRESENT AND PUT OUT THE FIRE AND DISCONNECTED THE BATTERY. I COULD HAVE LOST MY LIFE. I HAVE ALL OLD PARTS REPLACED. *TR