Mercury Sable P Codes (Powertrain) P0300 - P0399

P0304 Cylinder 4 Misfire, Check Engine Light On Flashes On And Off, Done Wires, Plugs, Coil, Crank And Cam Sensors, Did Compression Test...

My Engine Light Came On My Car Has Been Stalling Now A Nd Then Can You Tell Me If I Need A Tune Up

I Have A Dead Miss And That Cylinder Is Obviously Not 'firing'. I've Replaced Plugs, Wires, And The Injector. The Cylinder Is...