What was found
GOB/LON - FLT 016 - AIR TURN-BACK. DURING LIFT-OFF, LEFT ENGINE STARTED TO STALL. EGT WENT TO 802. LEFT ENGINE WAS REDUCED AND STALL CONDITION DISAPPEARED. AIRCRAFT RETURNED AND MADE AN OVERWEIGHT LANDING WITH LEFT ENGINE IN IDLE. SUBMITTER STATED ENGINE NEEDS TO BE REPLACED AND AIRCRAFT INSPECTED FOR HARD LANDING AND OVERWEIGHT LANDING. NOTE: THIS ENGINE WAS RENTED FROM UNITED AIRLINES AND INSTALLED ON JUNE 12, 1999. AFTER INSTALLED, FLEW 35 HOURS.