What was found
DURING TRAINING FLIGHT, ENGINE STARTED EXPERIENCING PROBLEM. ACFT MADE A SAFE LANDING AND TAXIED TO RAMP. UPON INITIAL INSPECTION, IT WAS NOTICED THAT THE NR 2 CYLINDER FUEL INJECTION LINE HAD BECOME SEPARATED FROM WELD AT B-NUT ON FUEL NOZZLE. LINE WAS REPLACED AND ACFT WAS RUN UP, ALL OPERATIONS WERE NORMAL. PORBABLE CAUSE IS SUSPECTED TO BE A WEAK JOINT AT FITTING ON B-NUT.