As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THEY WERE EXPERIENCING A VERY SLOW IDLE DURING PRE TAKEOFF IDLE CHECK. IT WAS ADJUSTED. THIS ENGINE/FUEL CONTROL COMBINATION HAS BEEN THE SUBJECT OF AN AIRWORTHINESS DIRECTIVE CONCERNING UNSTABLE IDLE AS WELL AS VARIOUS SERVICE BULLETINS ABOUT THE SAME SUBJECT. EVEN WITH CONTINUOUS ADJUSTMENT AND CHECKS, IT IS NOT UNCOMMON TO HAVE MANY WRITE UPS PERTAINING TO HIGH/LOW OR LEAN/RICH IDLE PROBLEMS.