Contamination and/or misalignment of the regulator section of the right engine’s fuel servo, which resulted in excessive idle fuel flow and a total loss of engine power. Also causal was the pilot's failure to land immediately on the nearest runway at the destination airport, his failure to feather the right propeller following the loss of engine power while approaching the airport, and his failure to maintain airspeed while maneuvering with one engine, which resulted in a loss of control at a low altitude.