Incident Overview
A pilot encountered engine roughness while en route. After managing to restore smooth operation, the pilot continued to the destination. On approach, the aircraft was too high, prompting a go-around.
Sequence of Events
During the downwind leg of the traffic pattern, the engine again became rough, and this time the pilot was unable to correct the problem. The pilot did not attempt to use carburetor heat. Turning the aircraft toward the runway, the pilot cleared trees but subsequently stalled the aircraft. The aircraft was recovered from the stall just before ground impact.
Environmental Conditions
At the time of the incident, the temperature and dew point combination indicated an excellent potential for serious carburetor icing at cruise power settings.