Ford Repair: service engine light, vacuum leak, vacuum lines

Question
The light on my 99 taurus is coming on  with codes po171 po172. I changed the maf sensor but still have the same problem. running rough intermittently with light back on.

Answer
hey there if i remember correctly these are codes indicating the engine is running lean. that  indicates that there is a vacuum leak some where, chack all major vacuum lines and connections, and thene check for a possible intake leak. let me know what happens. good luck
Chris