What was found
ENGINE LOST POWER ON TAKEOFF. MADE A POPPING LIKE SOUND & SURGED, RECOVERED & THEN REPEATED. ACFT LANDED SAFELY. SUMPED WING TANKS, HEADER TANKS & FUEL STRAINER. THE ENG FUEL INJECTORS WERE CLEANED & THE ENTIRE SYS WAS SUMPED AGAIN. POST MAINT FLIGHT CHECK WAS SATISFACTORY, NO PROBLEMS WERE NOTED.