What was found
NR 1 ENGINE SURGED IN-FLIGHT CAUSING AN OVER TORQUE AND ACFT BECAME UNCONTROLLABLE. CREW THEN SHUTDOWN THE ENGINE. REMOVED MFC AND FUEL PUMP, MFC PN 3244853-19, SN-C31243V, TT-7648.77, TC-9192. UPON TAKEOFF CLIMB, BOTH ENGINES WERE OPERATING TOGETHER NORMALLY, HOWEVER WHEN THEY BROUGHT THE PROP TO 1050, THE NR 1 TORQUE SHOT UP TO 118. THEY THEN ATTEMPTED TO BRING THE POWER DOWN, HOWEVER THE ENGINE DID NOT RESPOND AT FIRST. IT EVENTUALLY RESPONDED AND THEY WERE ABLE TO GET BOTH ENGINES TO OPERATE AT 96 PERCENT. SHORTLY THEREAFTER, THE ENGINE STARTED SURGING UNCONTROLLABLY. THEY INDICATED THE TORQUE NEEDLE WAS FLUCTUATING ACROSS MOST OF THE GAUGE. THEY FELT AT THIS POINT THAT THE DIRECTIONAL CONTROL WAS BEING AFFECTED ENOUGH TO SHUTDOWN THE NR 1 ENGINE. THE CREW SHUTDOWN THE ENGINE AND DECLARED EMERGENCY TO RETURN TO FIELD.