2004 Intrepid SE 2.7 with about 90k
I bought it 3 years ago with about 66k and no problems.
I had Mustangs with a idle surge but never like this.

This started a during the winter. A few hours later it is gone.
Give it gas and it is rough and still surges with black smoke.
It happened again yesterday after being good since late winter.
Today it was fine.
This is one of many issues I'm having with the car.

Thanks
http://www.youtube.com/watch?v=8r2M5w0-KMc