As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE ROUGHNESS REPORTED BY CREW. PROBLEM CONFIRMED BY MX AND TROUBLESHOT TO FUEL DISTRIBUTION MANIFOLD NOT DISTIBUTING FUEL EQUALLY TO ALL CYLINDERS. MANIFOLD AND ENGINE ONLY HAD 7.6 HRS TSMOH BY MFG. MANIFOLD WAS REPLACED AND ENGINE RAN SMOOTHLY.