As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OWNER STATED ENGINE BEGAN RUNNING ROUGH. DEVIATED TO NEAREST AIRPORT. HAD TO KEEP PUMPING THROTTLE TO MAINTAIN ENGINE RUNNING. MADE PRECAUTIONARY LANDING AT AIRPORT. UPON COLD CYLINDER CHECK, REMOVED CYLINDER ROCKER BOSS COVER. PIN AND BOSSES FELL OUT. NEW AND OLD CRACKS EVIDENT. SUBMITTER STATED AD 94-05-05R1 PERTAINS TO THIS. (X)