Hi, I am in need of information on how to locate a vacuum leak. I've looked everywhere and can't find the "How to find a vacuum leak for dummies" version. Please help! I have a 1997 Ford Explorer XLT 5.0 V8. I am retrieving codes P0171 & P0174. (Lean banks 1 & 2). I have already replaced the MAF sensor. Codes came back. 1.) How many vacuum hoses are there? 2.) Where are they? 3.) How do I check them for leaks? (I read somewhere something about ether?) If someone can point me in the right direction. (Diagrams & actual photos would be great), I would seriously appreciate it. Thank you.