As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THROTTLE BODY AND METERING UNIT WAS FOUND TO BE OUT OF ADJUSTMENT, DURING INSPECTION THE CONTROL ARM AT THROTTLE BODY WAS FOUND LOOSE AND ROTATING ON SHAFT. NO ADJUSTMENT OF IDLE MIXTURE OR IDLE COULD BE PERFORMED DUE TO CHANGING CONDITION BETWEEN THROTTLE BODY AND METERING UNIT.