2000 ford windstar won't stay running

Sounds like you got a vacuum leak somewhere on that thing. Do you hear any hissing while its running. You can take some carb cleaner in aerosol can and spray it around the intake while its running to check for vacuum leaks. If it has one big enough the thing will change idle. Visually look for some sucked in vacuum lines on that thing. There is an IAC valve on top of the throttle body tap on it with a screwdriver and see if it idles. Lastly I hate to tell you those things were bad for upper plenum gasket leaks, you will need the upper plenum oring gaskets 6 I think, and the isolator bolts that hold it down, and 1 big upper plenum oring gasket. And the pcm will need a reflash when done should take care of the Check Engine Light.