As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI BEFORE TAKEOFF, THE ENGINE HAD AN UNCONTROLLED ACCELERATION WITH ASSOCIATED PROPELLER OVERSPEED. THE ENGINE WAS SHUTDOWN AND THE ACFT RETURNED TO THE RAMP. TROUBLESHOOTING LED TO THE REPLACEMENT OF THE FUEL CONTROL AND FUEL PUMP.