Q: How to repair issue below?

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2006 Mercury Mariner 3.0L, after reaching normal temperature, starts a continual, erratic drop in rpm due to IAC valve slamming shut. White/red lead has a continuous 12V, other lead has 10V and intermittently loses voltage enough to see meter needle move. Can Hear Valve slamming even better with air filter holder open.

My car has 141500 miles.
My car has an automatic transmission.

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