Have you checked the egr system and check for a vacuum leak???
It sounds like you may have a bad vacume hose.If you use some carb cleaner while it is running and spray it over the engine you should notice a difference on it running at idea in park and you spray in diff areas till you pinpoint the leak. Be carefull since the cleaner is flammable. you can use brack cleaner but you ned to be more direct where you spray it with it in park and idleing.
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