SMA PLT HAS PARTIAL PWR LOSS; FALLING FUEL PRESSURE AND MANIFOLD PRESSURE. AFTER TROUBLESHOOTING RPTR REQUESTS VECTORS TO NEAREST ARPT. MECH CAN FIND NO PROB.

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AT 11000 FT NEAR AKRON; OH; IN CRUISE FLT; I NOTICED THE FUEL PRESSURE BEGIN TO FALL; AND SHORTLY THEREAFTER A DROP IN MANIFOLD PRESSURE. I BEGAN TROUBLESHOOTING PROCS (ALTERNATE AIR; SWITCH FUEL TANKS; MIXTURE; FUEL PUMP ON; MAGNETOS; ETC); AND WHEN IT BECAME APPARENT NOTHING WAS WORKING; ADVISED ATC I WANTED TO HEAD TO AKRON ARPT; DUE TO THE FACT I WAS ONLY GETTING PARTIAL PWR. ATC GAVE VECTORS TO THE ARPT; AND WHILE DSNDING; I CONTINUED TO TROUBLESHOOT THE PROB. I COULD ONLY GET THE ENG TO RUN AT APPROX 1000-1300 RPM. ANY FURTHER ADVANCE OF THE THROTTLE WOULD RESULT IN THE ENG BOGGING DOWN. I ASKED ATC IF THERE WAS A CLOSER ARPT AND WAS ADVISED KENT STATE ARPT AND AKRON FULTON WERE; AND RECEIVED VECTORS FOR KENT STATE. SOMEWHERE BTWN 3000 FT AND 4000 FT MSL I TRIED ADVANCING THE THROTTLE AND WAS ABLE TO OBTAIN FULL PWR. AT THAT POINT I ASKED TO CONTINUE TO AKRON-CANTON ARPT. ENRTE; THE CTLR ASKED IF I WANTED THE 'EQUIP' TO BE DEPLOYED OR STANDING BY AND I DECLINED. I BROKE OUT UNDER THE BROKEN OVCST LAYER; SAW THE ARPT AND WAS CLRED FOR A VISUAL APCH. AFTER LNDG; THE ACFT WAS CHKED BY A MECH AND NO PROBS WERE FOUND. HE SUSPECTED THERE MAY HAVE BEEN SOME WATER IN THE FUEL SYS WHICH FROZE. NO WATER WAS NOTED ON PREFLT; HOWEVER; A LARGER SAMPLE AND WAITING LONGER AFTER FUELING MAY HAVE INDICATED THE PRESENCE OF SOME IF THE PROB WAS INDEED CAUSED BY WATER.