As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSTALLED A NEW CARBURETOR ON 9-3-2010. AFTER 21 HOURS TIME IN SERVICE WE WERE UNABLE TO ACHEIVE PROPER LEANING AT ANY RPM AND HAD A POWER LOSS OR STUMBLE WHEN REDUCING POWER BACK TO CRUISE RPM. WITH THE ASSISTANCE OF A MFG REPRESENTATIVE, THE ACFT WAS INSPECTED AND WE WERE INSTUCTED TO RETURN CARBURETOR TO BE INSPECTED AND O/H.