2000 Lincoln LS V8 rough idle
My Lincoln LS, when stopped, idles really rough. When moving, it drives smoothly though can get a little shaky around 50 mph, then stops as I speed up. There is no light or message on the message center. I have had new spark plugs, new alternator and thermostat housing and thermostat put in over the past couple of months. But it still shakes. Help.