WHILE DRIVING AT INTERSTATE SPEEDS FOR APPROXIMATELY 130 MILES (2.5 HOURS), VEHICLE SPUTTERED AND LOST POWER, IT STABILIZED AT~40 MPH. A CHECK ENGINE LIGHT AND RED LIGHTING BOLT DISPLAYED. WE EXITED THE INTERSTATE AND MADE COURSE TO A DEALERSHIP UTILIZING SMALLER HWYS. EN-ROUTE TO THE REPAIR SHOP, AT ABOUT 40 MPH, VEHICLE STARTED EMITTING SMOKE TO INCLUDE INSIDE THE CABIN. STOPPED THE VEHICLE AND EVACUATED ALL 4 PEOPLE INSIDE. FLAMES AND HEAVY SMOKE SOON BECAME VISIBLE AS WE WATCHED FROM AFAR. LARGE FLAMES GREW AND QUICKLY ENGULFED THE WHOLE VEHICLE. FIRE DEPARTMENT ARRIVED AND PUT OUT THE FIRE.