Having a little miss on 2003 Lincoln Navigator

My car is not idling very smooth. Other than that it is great. What can cause this?

Asked by for the 2003 Lincoln Navigator
Your engine could have a vacuum leak, dirty injectors, old spark plugs to name a few things. Low idle speed can cause this too.
Do you have a check engine light on or any other warning lights?
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this is not a awnser to the question but i have a 03 navigator that slightly shakes and a complete stop! do you have this problem also?