As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BEFORE TAKEOFF, THE PILOT NOTICED THAT THE ENGINE IDLE AND TAKEOFF RPM ERRATIC IN THE NORMAL ENGINE CONTROL MODE, IN MANUAL ENGINE CONTROL MODE, ENGINE PERFORMANCE AND RPM`S WERE STABLE. REPLACED ENGINE FUEL CONTROL COMPUTER WITH SERVICEABLE REPAIRED COMPUTER AND PERFORMED ALL REQUIRED ENGINE RUNS AND ADJUSTMENTS IAW MM. (K)