What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Pilot and mechanic were performing engine cylinder break in due to replacement during annual inspection. During return to departure airport the engine started running rough. The pilot switched the fuel selector to the left tank. Engine would idle but would sputter when the throttle was advanced. Aircraft was descending under partial power and pilot determined he was unable to make it to the airport. Emergency radio calls were made and pilot performed an emergency landing on a state highway approximately 3 miles nnw of the airport. Aircraft was undamaged and aircrew uninjured.
As the FAA filed it
PILOT AND MECHANIC WERE PERFORMING ENGINE CYLINDER BREAK IN DUE TO REPLACEMENT DURING ANNUAL INSPECTION. DURING RETURN TO DEPARTURE AIRPORT THE ENGINE STARTED RUNNING ROUGH. THE PILOT SWITCHED THE FUEL SELECTOR TO THE LEFT TANK. ENGINE WOULD IDLE BUT WOULD SPUTTER WHEN THE THROTTLE WAS ADVANCED. AIRCRAFT WAS DESCENDING UNDER PARTIAL POWER AND PILOT DETERMINED HE WAS UNABLE TO MAKE IT TO THE AIRPORT. EMERGENCY RADIO CALLS WERE MADE AND PILOT PERFORMED AN EMERGENCY LANDING ON A STATE HIGHWAY APPROXIMATELY 3 MILES NNW OF THE AIRPORT. AIRCRAFT WAS UNDAMAGED AND AIRCREW UNINJURED.