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Stalling at idle on 2000 Mercury Villager

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Changed plugs, cap, rotor, wires and still having idle issues. Runs fine at speed but drops down to 400 rpm or less at idle then back to 650 until engine stalls. I have yet to see a check engine light.
(1) Answer
Try cleaning out the idle motor and the throttle body. Make sure there aren't any vacuum leaks.