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Don't know what you mean exactly by a " rolling idle" I think you mean that when you come to a stop something weird happens--Does it want to die ? or does it surge ?
Either way tell us exactly when and what it does-----YES all those issues can easily be fixed with tuning---assuming you DON"T have any other issues like a vacuum leak--
Also it would help to know more about your engine--Cubic inches-- cam --hdrs--intake
CAI 6 speed or automatic---