A PA23-250 IN CRUISE AT 6000 FT DECLARED AN EMER DUE R ENG FAILURE. RESTARTED SEVERAL TIMES. IN DSCNT AT 4000 FT THE L ENG FAILED. LANDED OFF FIELD. NO DAMAGE OR INJURIES INCURRED.

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I WAS GETTING RADAR VECTORS FOR ILS RWY 35R TO ZZZ AT CRUISING ALT OF 6000 FT MSL; R ENG STARTED RUNNING ROUGH. AS SOON AS R ENG STOPPED WORKING; I REQUESTED 4000 FT MSL. AFTER I DID ALL THE TROUBLESHOOTING IN CHKLISTS; I DECIDED TO FEATHER THE R PROP. A FEW MINS LATER; I WAS ABLE TO RESTART THE R ENG. HOWEVER; THE R ENG DIED AGAIN. I RESTARTED R ENG A FEW TIMES. FINALLY; I COMMITTED TO SHOOT THE ILS RWY 35R APCH TO ZZZ WITH R PROP IN FEATHERED POS. AT THIS TIME; I MADE RADIO COM TO APCH THAT MY R ENG FAILED. WITHIN 5 MINS; AND THE R ENG SECURED; I SAW L FUEL FLOW GAUGE WAS GOING DOWN LOWER AND LOWER. BEFORE L ENG STOPPED WORKING; I SWITCHED FUEL SELECTOR FROM OUTBOARD TO INBOARD; FUEL PUMP ON; MIXTURE FULL RICH; ALTERNATE AIR OPEN; ETC. HOWEVER; AS I GUESSED; L ENG STOPPED WORKING. THERE WAS NOTHING MORE I COULD DO. I TOLD APCH CTLR 'L ENG IS DEAD; BOTH ENGS ARE DEAD.' OF COURSE; THE AIRPLANE WAS GOING DOWN JUST LIKE A ROCK. IN THE END; I WAS LUCKY ENOUGH TO FIND THE PERFECT PRECAUTIONARY/EMER LNDG SPOT IN A FIELD AFTER BREAKING FROM THE CEILING OF 1200 FT AGL AND VISIBILITY OF 1 SM. I DID EVERY SINGLE EMER PROC LIKE I WAS TAUGHT FROM MY CHIEF PLT. I MADE THE LNDG ON THE GRASS FIELD AT APPROX 14.0 NM ON 034 DEG RADIAL FROM TACAN. I DIDN'T GET ANY INJURIES; NOR AIRPLANE DISTRESSED. IN CONCLUSION; I AM SUBMITTING THIS RPT REGARDING TO DEV FROM FAR IFR FLT RULE AS WELL AS MAKING PRECAUTIONARY/EMER LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE EMER PROCS WERE FOLLOWED AS WERE TAUGHT BY THE CHIEF PLT AND RESULTED IN NO INJURIES OR ACFT DAMAGE. THE MAINT EXPERTS THAT CHKED THE AIRPLANE AT THE LNDG FIELD HAD A LOT OF GUESSES BUT MAINLY CONCLUDED THE FUEL TANK VENTS ICED UP STOPPING FUEL FLOW TO THE ENGS.