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2000 Dodge Durango 5.7L V8
Had the same issue where the idle would surge while at a stop light or in park. Died a few times while idling. Replaced both the Idle Air Control Valve (or motor its called both) and Throttle Position Sensor and now she idles perfectly at 600 RPM. In my case, I believe the IAC motor was the culprit. Upon removing the part, I noticed it the plunger was extended more than the new part (It was stuck in the out position) and dirty as hell. Replaced both anyway since I was in there. Parts are available for approx $100 for both from Advance Auto. Make sure when you call you get somebody that knows what they are doing. Yes, they carry the parts they are NOT dealer only items!
See attached image for location of parts!
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