Ok guys. Last year in November, in stop and go traffic, my Pathfinder started popping and sputtering in the intake and wouldn't go over 10 mph. Idled fine, and even seemed to rev ok in neutral. But as soon as I put any load on it, it would pop and sputter. I disconnected the O2 sensor (because it was easiest) and it ran pretty good thought not 100%. I drove it occasionally through the winter like that, and the most noticeable thing was the exhaust was really stinky (probably cooking the cat). I finally had time in May to look into it, so I connected the sensor to see what happens and it ran perfect. So I left it and kept driving it. Everything seemed fine until today when the same thing happened!! It runs perfect cold, but as soon as it warms up a little (probably until closed loop) then it falls on it's face. Unplug the O2, and drives kinda normal. So, it is temperature related somehow. Yes, the light is on, always... I haven't pulled codes yet. Im not sold it's the O2 sensor.
Thoughts?