[capnray]

My 2002 Ranger started throwing P0171 and P0174. I know from experience with other vehicles that this involves the MAF sensor and vacuum leaks downstream of the MAF. My MAF was clean, so I checked the vacuum lines, all were OK. I then noticed that the PCV system vents directly into the intake at the throttle body. I found a rubber elbow abraded by the upper radiator hose. Autozone does not carry the item, so I decided that 5/8" heater hose would work, however I had none. I found a Pinto breather hose which I modified and that should fix the problem.

The last thing you would suspect is PCV, but any system connected after the MAF must be checked when these codes appear