SMA PENETRATES N90 TCA TWICE IN 1 DAY.

Narrative

WHILE OVER DANBURY ARPT; I CONTACTED NY APCH FOR VFR CLRNC TO TRANSITION TCA TO HOME ARPT; 47N (KUPPER; NJ). NY APCH SAID MY XPONDER WASN'T OPERATING AND TO STAY CLR OF TCA. I PROCEEDED GENERALLY W TO A POINT CLR OF TCA PERMITTING STRAIGHT (LORAN ON BOARD) RUN TO 47N OUTSIDE TCA. FLT PROCEEDED NORMALLY UNTIL APPROX 10 MI WNW OF MORRISTOWN; NJ; ARPT. ENG BEGAN RUNNING ROUGH WITH DROP IN MANIFOLD PRESSURE; POSSIBLY CARB ICE. ENG HAD BEEN INSTALLED ONLY DAY PRIOR AND HAD ONLY APPROX 3 HRS ON IT. I CONTACTED MORRISTOWN TWR AND TOLD THEM OF MY SIT AND ASKED CLRNC TO MAKE A PRECAUTIONARY LNDG. I THEN TURNED TOWARD MORRISTOWN HOLDING APPROX 4500 FT FOR SAFETY. I DID NOT THINK TO CONTACT NY APCH FOR TCA CLRNC (FLOOR OF TCA AT MORRISTOWN IS 3000 FT). I STAYED IN CONTACT WITH MORRISTOWN TWR AND ONCE ARPT WAS GUARANTEED; BEGAN DSCNT TO UNEVENTFUL LNDG. I STOPPED THE ACFT AT PARKING AND CHKED SPARK PLUGS FOR TIGHTNESS; WIRES FOR CONNECTIONS; OIL LEVEL AND THE LIKE. I THEN STARTED ENG AND DID SEVERAL RUNUPS WITH NORMAL INDICATIONS. I THEN RECEIVED CLRNC TO TKOF AND ASKED TO BE ABLE TO CLB TO ALT OVER ARPT IN CASE PROB DEVELOPED. AT 2000 FT I SWITCHED TO NY APCH. I CLBED THROUGH 3000 FT; BUT I DON'T REMEMBER IF I WAS CLRED INTO TCA OR NOT. NY APCH THEN GUIDED ME TO APPROX 20 MI TO 47N WHERE UNEVENTFUL LNDG WAS MADE. IN HINDSIGHT; I SHOULD HAVE LEFT THE PLANE AT MORRISTOWN AND TAKEN A TAXI.