Did you check fuel pressure? Fuel filter fairly new? Air filter clean and all duct work tight? Battery voltage good when engine is running? Check Throttle Position Sensor for codes and values. Also Ignition coils go bad on these ,as often as you change your socks. TPS is avail on line and auto parts store. You do not have to go to dealer or change entire throttle body, just the sensor,if bad.
You will need a new TPS Sensor,Egr Valve, Ignition Coil or two and a Transmission Solenoid Pack,pretty soon. I have a 2004 V8 L/S. Tough car to troubleshoot and a never ending saga,as is most Fords.
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