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Good evening, this sounds to me like one of two things. You have a vacuum leak or the issue with the throttle body. What is your engine and also have you checked these items yet?
Okay, I need to know what engine you have? V6 or V8?
Okay, this is what I want you to do. I want you to remove the throttle body and clean it very thoroughly. After a few years they get some gunk and do not operate correctly causing idle issues and sputtering. Before doing this I want you to inspect for a vacuum leak. Get a can of carb or brake cleaner. With the vehicle running take the can of spray with the extension tip and spray all around the intake manifold, any vacuum lines under the engine bay. If the idle changes when you are doing this that is where it is leaking. Repair or replace as needed. Sometimes if the intake is leaking you can loosen the bolts and tighten them back up and she will seal up. I have attached a how to on the throttle body removal. Let me know if you have any questions, thanks. Charlie