DRIVING FREEWAY SPEED, ENGINE LOST POWER, ELECTRONIC THROTTLE CONTROL LIGHT FLASHED, THEN ENGINE LIGHT; PULLED ONTO SHOULDER, RAISED HOOD, OBSERVED FIRE AT VALVE COVER/WIRING HARNESS. MECHANIC'S SUBSEQUENT INSPECTION REVEALED VALVE/ROCKER ARM FAILURE RESULTED IN PUNCTURED VALVE COVER THAT RELEASED OIL ONTO HOT ENGINE RESULTING IN FIRE. ROCKER ARM FAILURES ARE COMMON ON MOPAR 3.7 ENGINE - GOOGLE THE TERM AND MANY HITS WILL APPEAR. THIS IS UNACCEPTABLE FOR AN ENGINE WITH 82,000 MILES THAT WAS SERVICED REGULARLY ACCORDING TO MANUFACTURER RECOMMENDATIONS. NEW ENGINE NOW REQUIRED.