Your throttle may be sticking near the idle position or is obstructed, never going all the way down. (Have a Taurus with similar problem.) You may need to clean around the throttle stop and/or adjust it. Or the throttle cable is not releasing all the way, keeping the throttle from going down to idle.
Just some thoughts.
Im ignorant on the 3.8s, but where is the IAC located? My uncle just picked up an 01 and it has the surging idle problem. I am familiar with the 5.0s, but havent actually looked at these engines yet. Thanks in advance
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