THE PLT RPRTD HE HAD BEEN HAVING SOME TROUBLE WITH A MAGNETO & WAS GOING TO FLY THE ACFT TO EMMETT, IDAHO FOR ADDITIONAL MAINTENANCE. WHILE EN ROUTE AT 2000 AGL, THE ENG LOST POWER. THE PLT BEGAN AN EMERGENCY LANDING ON A DIRT ROAD. HOWEVER, JUST BEFORE LANDING, THE ACFT HIT A POWER LINE & CRASHED. AN INSPN OF THE ACFT REVEALED THE FUEL SELECTOR WAS POSITIONED TO THE RIGHT TANK, WHICH WAS EMPTY. THE PLT STATED THAT HE WAS SO AWARE OF A POSSIBLE MAGNETO PROBLEM THAT HE DID NOT THINK TO SWITCH FUEL TANKS.