As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE PRACTICING FORCED APPROACHES, FULL POWER WAS APPLIED FOR A GO-AROUND. THE ENGINE DID NOT RESPOND AND STARTED TO COUGH, POWER WAS REDUCED AND THE AIRCRAFT LANDED. POST-FLIGHT INSPECTION FOUND A SMALL PIECE OF BRASS TUBING IN THE NR 1 SPARK PLUG. FURTHER INVESTIGATION FOUND THE CARBURETOR ACCELERATOR PUMP DISCHARGE TUBE WAS MISSING. THE CARBURETOR WAS REPLACED.