As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE SPUTTERED AND BEGAN RUNNING ROUGH. MANIFOLD PRESSURE TRIED TO CLIMB TO AMBIENT PRESSURE AT IDLE. RIGHT FORWARD INTAKE HOSE WAS LEAKING DUE TO CLAMPS (PN 539487) BEING LOOSE WHERE BALANCE TUBE (PN 629937) ATTACHES. REPOSITIONED HOSE AND CLAMPS AND SECURED BY TIGHTENING CLAMPS.