2004 Ford Taurus engine idle shaking

This could be any number of concerns, the first and most basic is when was your last complete tune up? I am talking wires, plugs, PCV all filters? If no codes are present start with the basic stuff, just like the 50's! Let me know where you stand with it after the tune up. If the check engine light is on get the code(s) read, autozone will do it free. Then get back to us with the code(s), before you replace parts! If no codes check fuel pressure, Look for the video on this site follow the links in the upper right corner.