First, read through quite a few threads on these codes. Second, car is running great, 200-300 miles over weekend, go to breakfast this morning and CEL comes on with P0171/P0174 codes. I will check the following, based upon a Joegr post: "A lean condition without misfire would possibly be air/vacuum leak low fuel pressure clogged/dirty injectors Bad TPS bad/dirty MAF bad O2 sensors bad gas" QUESTION(s): 1) The Crankcase vent tube: A month or more ago, when removing air intake system - pipe, tray, etc (to get to sway bar bushing), I removed the crankcase vent tube from the manifold. I noticed a small piece of the tube where it attaches break off. (Also, was at junk yard the other day and an '06 had the exact same chip out of the attachment tube...same shape, location, and size. Hmmmm.) I haven't had issues until this morning. Is that tube attachment point replaceable? 2) Will codes clear themselves when problem is addressed or do I need to clear them through the OBD2? I want to make sure I fix the problem, not just clear codes. 3) Which vacuum lines should I inspect/replace? The ones attached to air filter intake? Are there others? 4) MAF cleaning? Carb cleaner ok? Thanks!!!!