my car dies while ideling.also while sitting still,my speedometer might show up to 40 mph, then back to o.
Your VSS( Vehicle Speed Sensor) is faulty. This will cause the symptoms you stated. Here is a video showing how to remove it if your handy with a wrench.
http://www.youtube.com/watch?feature=player_detailpage&list=FLQPoRsLtaktCTa0mjxOgcrQ&v=y0823ZDqxiU#t=118s Your Taurus might be slightly different.
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