Whenever you get multiple codes you should read up on each and learn how they may be causing each other or interacting. Gearchatter.com has all your codes and the FSM info for each listed. Sure it's for a vette or GTO, but it's all the same stuff, same tests. According to a quick hit that I did P0171 shouldn't happen while P0102 is set. So determining which order they set is probably going to help you track the issue.
P1404 isn't going to be a bad vacuum line. That's actual measured pintle position.
P0171 could be a vacuum leak, but it'll likely clear when you fix the MAF/EGR codes.
P0102 could be a bunch of things, I'd look at any work recently done to the car and the connetor etc.
