Idle Question?

I have a 95 GT and lately when the car has been driven for awhile and heated up it idles at 650 rpm and sometimes lower. Also since this has started the engine has died twice from idle, sitting still with the clutch fully in. I am curious to what is causing this and I would appreciate any help!

Thanks In Advance
 
Mine has the same problem and it drives me nuts. If you notice when you put your AC on the idle raises just a bit (to like 750 on my car) and it becomes a lot smoother. My goal is to try and get it to idle like that all the time. But I've yet to find a way to make it happen. hopefully someone will shine some light on it for us.