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well i would start with your intake manifold and throttle body. they could be dirty. solution! throttle body and intake cleaner. you can find it at your local parts store. FYI......be sure to get a cleaner that is o2 safe if you use something other you will probably foul your o2 oxygen sensor, this will give you a check engine light and probably have to replace the sensor, save your self the head ache. if no luck on that try your spark plugs and coils. you could have a or some filed spark plug(s) or bad coil(s). i recommend you take to a professional .

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Q: Why would your 1999 Lincoln Navigator idle rough?
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