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Q: what can cause a rough idol? had a tune up at 100,000 now 130,000 on 1999 Mercury Villager

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It idols rough when it is gear when stopped at red light or waiting in traffic. No check engine lights on
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Rough idle can be caused by basic ignition tune up items (plugs, wires, cap, rotor...), or even EGR flow issues. Not to mention fuel injectors. Your "tune up" - what did it include?
You could have another injector. You could have an ignition system issue again. Only way to tell anything is to have a diagnostic tool hooked up to check specific components...can help.
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