I have heard numerous horror stories that are so similar to the problems I've been having my Passport. Lots of other owners have reported problems with a sporatic gas gauge, non- functioning intermitten wiper setting, ERG valve trouble, and oil that seems to rapidly dissappear mysteriously.
It's a fun vehicle to drive, especially for long trips. Just be sure to check the oil regularly.
Better quality parts; especially the ERG valve, windshield wipers, and motor in general.