I WAS DRIVING ON I-91 AT NORMAL HIGHWAY SPEED AND THE CAR SUDDENLY STARTED DECELERATING ON ITS OWN WITH NO WARNING LIGHTS OR OTHER INDICATION OF A PROBLEM. I PULLED OVER IMMEDIATELY AND SHUT THE ENGINE OFF AND GOT OUT TO INVESTIGATE AND SAW SMOKE UNDER THE HOOD. I CALLED 911 AND THE CAR WAS VISIBLY ON FIRE BY THE TIME THEY ARRIVED.