how do you reset the idle part of the computer? on 1993 Chevrolet Lumina

when I stopped the engine causes the car to lunge and will die also will not idle

Asked by for the 1993 Chevrolet Lumina
Could you give more info please. Does this happen all the time or only when warmed up? Does this condition start after cruising for a while at highway speeds and then start happening when you come to a stop? please give more specifics.