As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OVERHAULED CARBURETOR FURNISHED WITH LYCOMING OVERHAULED ENGINE WOULD NOT IDLE BELOW 1,000 RPM AFTER BUILD-UP AND INSTALLATION. CARUBURETOR WAS NEWLY OVERHAULED. REMOVAL AND INSPECTION REVEALED THE THROTTLE PLATE WAS NOT ALIGNED CORRECTLY AND WAS BINDING ON THROAT OF CARBURETOR WHEN CLOSED AND WOULD NOT HIT IDLE STOP WITH SCREW FULLY BACKED OUT.