What was found
AIRCRAFT DEPARTED KHND. A FEW MINUTES AFTER REACHING FL 190 AND SETTING CRUISE POWER, THE LEFT ENGINE BEGAN TO LOSE POWER. THE LEFT ENGINE MANIFOLD PRESSURE BEGAN DECLINING SO PILOT DECLARED AN EMERGENCY AND IMMEDIATELY DIVERTED TO KSGU. THE INITIAL LOSS IN POWER WITH GRADUAL RETURN LED THE PILOT TO BELIEVE THERE WAS FUEL CONTAMINATION AND AFTER SUMPING SEVERAL GALLONS OF FUEL, THE PILOT WAS ABLE TO REMOVE A VERY SMALL AMOUNT OF A MILKY SUBSTANCE ALONG WITH SOME SEDIMENT THAT HE HAD NOT SEEN IN THE SUMP IN KHND. THE PILOT BELIEVED THIS TO BE THE ISSUE AND CONDUCTED A SOLO FLIGHT AROUND THE ST. GEORGE, UT VALLEY AND BOTH ENGINES RAN VERY WELL. HE RETURNED TO KSGU AND HAD THE FBO TOP OFF MY FUEL. THE PILOT SUMPED THE AIRCRAFT AGAIN AND FOUND NO FOREIGN DEBRIS AND DEPARTED KSGU AT APPROXIMATELY 1445 MDT ENROUTE TO KBFF. EVERYTHING RAN GREAT UNTIL REACHING ABOUT 16,000FT WHEN THE MANIFOLD PRESSURE BEGAN TO DROP AGAIN ON THE LEFT ENGINE. THE PILOT RETURNED TO KSGU AND CONTACTED A MAINTENANCE SHOP TO HAVE THEM DIAGNOSE AND FIX THE PROBLEM. MAINTENANCE FOUND A BROKEN CLAMP ON THE INTAKE BALANCE TUBE BETWEEN CYLINDERS #5 & #6. MAINTENANCE REPLACED THE CLAMP, APPROVED THE AIRCRAFT FOR RETURN TO SERVICE. THE PILOT WAS ABLE TO FLY THE AIRCRAFT TO KBFF LATER THAT MORNING WITH NO FURTHER ISSUES.