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Thanks for the responses. I ended up bringing it into the dealer, and it turns out it was the mass air flow sensor. The first shop told me they checked it, but I guess they missed something. I know I probably spent too much but I'm happy the issue is now resolved. Thanks again for your help.

This is my first post on this site. I figured I would try here since your great member posts helped me to fix my vibration in my Mountaineer due to lack of friction modifier in the rear differential. Here's my problem, the Mountaineer says it's running rich on both banks. PO172 and PO175. I...