2001 Nissan Pathfinder Could use some help

My Pathfinder starts and drives fine in cooler temperatures, after I drive it for about 30 minutes it will shut off on its own. I move it to neutral start it and it starts fine, but then when I accelerate it freezes at about 2300 RPMs and starts jolting. I have to carefully watch my RPMs and keep it under 2300 and it will drive fine(granted I have to accelerate like an old man) but as soon as I hit 2300 it freezes and jolts fairly violently. Also when I start my car and it's 85 degrees or more it is very sluggish and smoke comes pouring out of my exhaust til I get it driving for about a minute. *Sigh* my car is jacked.