Ford Windstar Engine Surge

My Engine Starts Without A Problem. When I Have It In Drive At A Stop, After 4-5 Minutes The Engine Surges And Rocks For About 20 Seconds....

My Van Lunges And Jerks While Idling At Stop Signs. I Wonder What Causes This, And What Can I Do To Remedy This?

1999 Ford Windstar Sometimes Surges More When Its Wet Or Cool Outside It Seems Like It Does It More At Around 1200 To 1800 Rpms And Around...

Our Windstar Has Recently Started Surging, Almost Jerking. It Does It Between 35&40 Mph And If On The Highway Right About 67 Mph. We Have...

Can U Tell Me Why Sometimes It Feels Like Chugging---surging And How Do U Fix It