02 Jetta GLS W/57K issues

[djdelly]

Pulled to following codes from the car today:

P0442 (Emissions Control System)
P0171 (System to lean)
P0300 ( Random/Multiple Cylinder Misfire Detected)

I read somewhere that the P0171 might still be covered under a 7 year/70,000 mile warrenty

Any idea about the rest? I'm getting ready to move, so I would like to take care of these asap and would like any info about how easy it would be to DIY.

Thanks,