iac(idle air control) is likely the cause remove it from the throttle body and give it a good cleaning with an old toothbrush and carb cleaner.spay inside the hole also,hell might as well do the whole throttle body.Just out of curiosity do you have a k&n filter, if you do get rid of it.that seems to make it happen alot.ever since i got rid of mine i havent had a problem.

out of all the jeeps in this town the d**n gremlin had to invade mine

I've done so much,with so little for so long i can practicly do anything with nothing