What's going on with my Ford Windstar engine?

What's going on with my Ford Windstar engine?
Added (1). When the car first starts up it stars shaking and the engine kept raving slightly by itself, but after a while it stops and runs normal? Look at the video below:

http://vid1383.photobucket.com/albums/ah297/pawlowski1kacper/GOPR0044_zpsqqzo7dcl.mp4

Thank you!

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