Well out of no where the ranger started to run badly. It was idleing badly, sounded like I had a cam in it and stalls after a while. Also came up with a bank 1 lean code. Where should I start looking first. Has new plugs and wires probably a few months old.

 

Haha. Lots of people have this problem, just got mine fixed last week. There is a little piece of vaccum hose under the upper radiator hose. Its L shaped, crank your motor and see if you can hear it hissing or see a hole in it, if so, thats your problem.