I would first try this ... lift a battery cable for five minutes and reconnect. As soon as the engine check light comes on, have the codes read to see which ones are first to show. If you have to drive a long way to get to parts store ... you may have to do this all in their parking lot, or down the street.
Of course we can't always get to things as we should, but codes should be dealth with as soon as possible ... or they will lead to other codes and bad conditions. It is likely that you have a vacuum leak ... it could be associated with the intake manifold and the famous isolator bolts. I don't know if your year model has this issue or not.
As far as whether you should repair or not ... that answer depends on you more than the vehicle. If you have the time, skills, tools, and work space ... the Windstar is very fixable and can be made to run "forever". But if car repair is not "your thing" ... need very repairable transportation, "right now' ....and you have to depend on paying others to repair for you, I would be inclined to let it go. Also depends on how deep your pockets are.