Fast idle 89 F. Taurus

My Taurus has a fast idle when it statrs up. It stays high even when the engine is warm/hot. Each time when I put it in Reverse or Drive it lunges into gear. The only thing that helps the idle get lower is when I turn on the A/C...
Any suggestions?

My Taurus has a fast idle when it statrs up. It stays high even when the engine is warm/hot. Each time when I put it in Reverse or Drive it lunges into gear. The only thing that helps the idle get lower is when I turn on the A/C...
Any suggestions?

I suggest you post this in the taurus forum.

Also check the ICV.