SO.. 62k miles on the car dealership maintained, family owned, 2001 SE, vq30 4spdAT
1 vacuum leak (It's loud and there but nobody can find it, i mean nobody)
2 lean banks (p0171, p0174)
3rd problem is p0100, except i just replaced the MAF with an OEM from nissan. (182.60 btw)
But in all seriousness i want to push it in traffic, help?

 

Typically with the codes P0171 and P0174 when saying the O2 sensor are not working, but when two codes are set together the suspect would be the maf air flow sensor. The vaccum leak will set off a fault code causing the computer thinking the MAF air output is high. So I would start looking at all lines are rubber vaccum that would be attach to the intake manifold would have signs of cracked or hardening which can be brittle cause a leak. Best way is get carb cleaner while the engine is running and spray around the hose and see any bubbles or some kind of sucking, then you'll find the leak.

 

Another thing to check is the rubber tube between the maf and the throttle body. Those things do crack with age.

 

Thanks, both of you reconfirmed what i expected I was debating just cutting a section near the end piece and seeing if it stopped.
It's whistling pretty bad and under throttle it dies but i'll start with finding that 'itch