As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT REPORTED A ROUGH ENGINE THAT RESULTED IN A PRECAUTIONARY LANDING. THE INITIAL INSPECTION REVEALED THE NR 1 CYLINDER FUEL INJECTOR LINE WAS BROKEN IN TWO AT THE NOZZLE END. THE FLIGHT SCHOOL OPERATES A FLEET OF 8 M20J AIRCRAFT. AD 93-02-05 IS ALWAYS C/W AT EACH 100-HOUR INSPECTION. THIS IS A COMMON FAILURE, AND VERY DANGEROUS.