As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL INJECTOR SERVO CAUSING ERATIC IDLE. BACK FIRING AND EXTREMELY RICH MIXTURE WHEN THROTTLE IS RETARDED. DISCUSSION WITH TECH REP SUGGESTED TO SEND UNIT TO REPAIR STATION FOR CLEANING. DUE TO SERVO MOUNTED VERTICALLY, NOT ALLOWING FUEL TO BE PROPERLY EXPELLED, TENDS TO PLUG DIAPHRAM PARTS AND IMPACT TUBES.