2004 Ford Taurus 2004 Ford Taurus SE Idling and Running Iss

Engine Performance problem
2004 Ford Taurus 6 cyl Front Wheel Drive Automatic

I Have A 2004 Ford Taurus SE With 3.0 OHV V6. When You First Start It Up When The Engine Is Cool It Will Go To A Very High Idle And When It Starts Warming Up It Idles Down Some Then It Will Come To A Rough Idle And Will Quit At Times. Stopping At A Red Light It Will Idle Rough. But Strangely Enough When Engine Is Warm, You Can Shut It Off For A Couple Of Minutes And Restart It And It Will Come To A High Idle Again For A Brief Moment Then Idles Back Down. While It Is Warm And The Car Is In Park, You Can Push The Gas Pedal To The Floor And The Engine Just Revvs Up And Down. The Tailpipe Has Became Black And The Car Is A Daily Driver. I Have Owned The Car For A Few Months And It Has Always Had A Rough Idle Going Up And Down. Recently, I Took It To A Garage And They Replaced The Fuel Filter, Coil Pack, A Oxygen Sensor, And Ran Seafoam Through The Vacuum System. When I Picked Up The Car From The Garage, I Put Some Seafoam In The Gas Tank. It Ran Great For A Couple Of Weeks But Now The Engine Light Came Back On And Still Has All The Problems I Described Earlier. Any Help Would Be Greatly Appreciated. Thank You.