Had the same issue on my 12 Frontier that I bought a month ago.
Took it to the dealer with 1k on it and had them bump the idle 50rpm. Idle is smooth now.
The pathfinder is actually built in Smyrna Tennessee although its first year was 05. Previous pathfinders were from Japan. I hope they worked the issues out as I just purchased a 2012 Frontier CC 6 speed.