I have a 2007 H3. I purchased it new in late 07. I have 48,000 miles on it.

I was in the high altitude yesterday (10,000 feet) and after a long descent on a jeep trail in first gear I got to town (about 8,000 feet). In town I slowed put in into drive then headed thru town. I came to a stop light the RPMs started to jump from 0 to about 500. then the engine died.
I stopped restarted the engine, and it almost did the same thing until I accellerated.
I was only going a few miles so I continued. The engine almost died a few more times when I would stop at stoplights. as long as I accelerated I was fine, no loss of power at all. The problem only occored when I would slow down.. (full tank of gas, new air filter)
that was late last night, today the engine idles fine and I have had no problems....

What could have caused that, and is there a more serious underlying issue I should address???

 

First thing to look at would be any codes set in the pcm. if nothing is present clean the throttle body until it is spotless this can be done with carb cleaner and a tooth brush. do this first and let me know how you fair there are other possible causes but try this first