Just purchased my Ranger last week at an auction. Decided to do the normal maintenance, oil change, air filter etc. Approx 1 hours after changing the air filter I see a check engine light. Scanner showed P0171 code....System too lean bank 1.....idle is perfect so not concerned with a vacuum leak. Will clean the MAF sensor tonight, but will also be checking real time stats later on the O2 sensors. Any other items I should check??

__________________
2003 3.0 (160.000) all stock