My apologies for posting this here but I did not see a "Windstar" category. I have a 2002 Windstar that is running rough at idle and while driving. This occurs while the vehicle has warmed up and when cold starting. I stopped by my local garage and they pulled the following codes but I do not where to start. The following codes are listed in order they were pulled: P0174, P0304, P0122, P1504 & P1401. I have replaced the coil pack approximately a year ago along with plugs and wires. I have the list of code descriuptions but not certain where to start. Any help would be greatly appreciated! Thank you.

 

Here's a good starting place, seems somewhat common on these models.
Vacuum Leaks From Intake Area Causing Lean Condition : Ford Windstar Common Engine Problems