What was found
WHILE IN CLOSED TRAFFIC 7R AFTER COMPLETING TURN TO CROSSWIND, APPROXIMATELY 600 FEET AGL, THE ENGINE SPUTTERED AND PARTIALLY LOST POWER. THERE WAS A 300 RPM DROP FOR ABOUT 3 SECONDS. AFTER 3 SECONDS, POWER RETURNED TO NORMAL. NO EMERGENCY WAS DECLARED, AND LANDING WAS AS PLANNED AND UNEVENTFUL.