Ford Fusion Engine Revs Up

When Idling Everything Is Fine. When I Shift Into Gear Rpm Drops Under 500 And To 0. The Engine Then Shuts Off And I Have To Restart. If I...

I Have A 08 Ford Fusion Sel. Auto.with 45k. Past Few Months It Has A Higher Idol And Rev Then Normal. When I Used To Press On My Gas Pedal...

Rpm's Keep Jumping From Normal 600-700 Down To 500 When Stopped. What Is The Problem??