hey guys.. well as some of you know.. my car is showing the p0174 and p0171 code.. im changing the fuel filter today and if that doesn't help it, i guess ill take it somewhere and have them look at it for vacuum leaks or o2 sensors... butttt i also have a few more questions... how can i find a vacuum leak? i know by obviously looking to find holes in the tubing but can you hear it? like from inside or outside of the car? and how hard is it to hear it if you can. because im pretty sure it makes a loud whining noise but idk.. and also, how do you know if you have an exhaust leak? and one last question, how can you tell if your clutch is going out? please give me some details on all three of these things because i dont really know what to look for. and if you guys have any other ideas as to why my car is running lean on bank 1/2, let me know!