What was found
(CAN) ABORTED T/O, AS POWER WAS APPLIED ABOVE 80 PERCENT TORQUE ON BOTH ENGINES, THE TORQUE NEEDLES BEGAN TO OSCILLATE RAPIDLY AND AN UNUSUAL VIBRATION WAS FELT THROUGHOUT THE AIRFRAME. THE T/O WAS ABORTED. POST EVENT TROUBLESHOOTING LED TO THE REPLACEMENT ON THE AUTOMATIC FUEL CONTROL UNIT ON THE NR 1 ENGINE BEFORE THE ACFT WAS RETURNED TO SERVICE.