What was found
(CAN) ACCELERATER DISCHARGE TUBE IN THE CARBURETOR VENTURI BROKE OFF, IT WAS SUCKED UPTO THE THROTTLE PLATE AND APPARENTLY JAMMED THE THROTTLE AT 2,00 RPM. PILOT COULD NOT ADJUST POWER UP OR DOWN. THE AIRCRAFT WAS FLOWN TO THE AIRPORT, ENGINE WAS SHUT DOWN AND A GLIDE TO LANDING WAS EXECUTED. AFTER TOUCHDOWN ENGINESTARTED AND RAN NORMALLY. IT APPEARS THE DISCHARGE TUBE FELL DOWN INTO THE INTA KE AIR BOXWHEN THE ENGINE WAS SHUT DOWN DUE TO NO AIRFLOW IN THE VENTURI. THIS ALLOWED THE THROTTLE PLATE TO WORK NORMALLY FOR THE TAXI. THE TUBE WAS FOUND LYING IN THE AIRBOX BY THE CARB AT FLAPPER.