EXPERIMENTAL ACFT ON IFR FLT PLAN HAS ROUGH ENG. REQUESTS VECTORS TO NEAREST ARPT. ATC VECTORS BUT HAS WRONG ARPT NAME.

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WE HAD LAUNCHED OUT OF TACOMA NARROW ARPT ON AN IFR CLRNC AND WERE RECEIVING NUMEROUS VECTORS TO PAINE FIELD. WE HAD BEEN LEVEL AT 4000 FT FOR APPROX 8 MINS AND HAD BEEN IN AND OUT OF CLOUDS THE WHOLE TIME. WE HAD PICKED UP A TRACE OF LIGHT CLR ICING WITH EACH CLOUD PENETRATION; BUT IT HAD QUICKLY EVAPORATED WITH EACH TIME THAT WE'D COME BACK INTO THE CLR. I HAD PULLED THE CARB HEAT ON BEFORE THE FIRST TIME WE'D ENTERED THE CLOUDS AND HAD KEPT IT ON UNTIL WE FINALLY BROKE OUT INTO THE CLR FOR THE LAST TIME. AS I COULD SEE THAT THERE WERE NO MORE TOPS RISING TO OUR FLT LEVEL FOR A GOOD MANY MI TO COME; I SECURED THE CARB HEAT. ABOUT 2 MINS AFTER LEAVING IMC; THE ENG SUDDENLY STARTED TO RUN QUITE ROUGH; EVEN MISSING SEVERAL TIMES. I IMMEDIATELY APPLIED CARB HEAT AND CALLED SEATTLE APCH. I INFORMED THEM OF THE PROB AND ASKED WHERE THE NEAREST ARPT WAS. AFTER A DELAY; THE CTLR CAME BACK WITH THE FACT THAT 'KITSAP' FIELD WAS ABOUT 6 MI BEHIND ME. I TURNED AND STARTED TO DSND WHILE ASKING FOR THE RWY LENGTH AND UNICOM FREQ AS I WAS NOT FAMILIAR WITH THAT FIELD. THE CTLR DIDN'T KNOW EITHER; BUT ANOTHER PLT PASSED THE UNICOM FREQ ALONG TO ME. BECAUSE OF VERY HAZY CONDITIONS I COULD NOT SEE THE FIELD. I QUICKLY SEARCHED ALL OF MY PUBLICATIONS BUT COULD FIND NO REF TO KITSAP FIELD. WHEN ABOUT 2 MI FROM THE RWY; I FINALLY MADE IT OUT THROUGH THE HAZE. IT TURNS OUT THAT THE FIELD THAT THE CTLR HAS BEEN STEERING ME TOWARDS WAS BREMERTON NATIONAL; (I FOUND OUT LATER) WHOSE NAME 10 OR 15 YRS AGO HAD BEEN KITSAP FIELD. HAD THE CTLR USED THE CURRENT NAME; QUITE A BIT OF CONFUSION COULD HAVE BEEN ALLEVIATED AND I WOULD HAVE BEEN BETTER ABLE TO HANDLE THE FLYING OF THE PLANE BECAUSE I WOULD HAVE BEEN ABLE TO WORRY LESS ABOUT NAVING. I KNEW THAT I WAS QUITE NEAR TO BREMERTON; A FIELD I HAVE FLOWN INTO SEVERAL TIMES; BUT I WAS AFRAID THAT 'KITSAP' WOULD TURN OUT TO BE A SMALL GRASS STRIP; SOMETHING MY ACFT COULD NOT SAFELY HANDLE. POST-FLT INSPECTION REVEALED A SMALL POOL OF WATER IN THE HOSE TO THE CARB; PROBABLY THE REMAINDER OF SOME MELTED ICE. ENG RUN-UPS WERE NORMAL; AS WAS A LCL TEST FLT; SO I CONTINUED BACK TO MY HOME. THE FREEZE LEVEL WAS AT ABOUT 4000 FT (MY ALT) AND THERE WAS A LOT OF MOISTURE IN THE AIR.