As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THAT ON RUNUP, HE WAS UNABLE TO CONTROL RPM. INVESTIGATION DETRMINED THAT THE THROTTLE CABLE HAD COME DISCONNECTED FROM THE CARBURETOR THROTTLE ARM. BOLT WAS PRESENT, BUT NUT AND COTTER PIN WERE MISSING INSTALLED PROPER HARDWARE AND FUNCTIONAL CHECKED, OK. (K)