As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED ON ENGINE RUN-UP AT LOWER POWER SETTING, ENGINE RAN ROUGH AND WAS DIFFICULT TO KEEP RUNNING. MAINTENANCE NOTICED ON GROUND RUN-UPS, ERRATIC FUEL FLOW INDICATIONS THAT CORRESPONDED WITH THE ENGINE ROUGHNESS. A NEW UNIT WAS INSTALLED AND FLIGHT TESTED NORMAL.