Problem with Nissan Frontier 3.5 V6 2000

Greetings Jhovenes fix that I have a problem with my frontier, the problem is that when the revolutions are unstable, sometimes they turn off, the gasoline pump and the filter have already changed and the filter remains the same, what will it be?

Felipe tries taking the thermostat to see how he reacts, that problem I have seen in Suzukis and it is the fault of the temperature sensor but before buying any thing there is ke Provar,

Greetings Felipe, it is good to try as Kikemec comments before investing in buying sensors (which are already expensive), proves the sensor taking it to the extreme states of measure functional If you cannot take out the sensor, disconnect it and measures the resistance with the cold engine, then connect and turn the engine again until hot, turn it off and disconnect and measures, as in the previous case if there is an appreciable variation is in good condition, whether it is static or does not measure, it is necessary to replace. I hope it helps you.

Solved
thanks for your suggestions, but in the end the problem was in the distributor, as a bearing has been ruined: Pinch: And the position sensor was full of metal pieces: Ohmy:, they cleaned it and changed the bearing and ready zero problems.
As we say here in Guatemala Pan Pa your Matate, greetings.