I have a 1993 Lumina APV that isn't firing any spark plugs. It actually hasn't been started in about 3 years. I've jumped the battery and it cranks fine and I just put new plugs and wires in but none of the spark plugs are firing. This is also not a result of it sitting for so long, it sat for so long because of the firing problem and was just never fixed. What could it be?

What engine do you have?....
Most probably crank position sensor, a common problem, specially at that age. Problem it is hard to get if a 3800.
www.avigex.ca/xport/ckps.jpg
www.avigex.ca/xport/ckpphoto.jpg
www.avigex.ca/xport/ckpsremoval.jpg
www.avigex.ca/xport/ckpulley.jpg
www.avigex.ca/xport/cksphoto.jpg
Other possibility is the ignition module. Just changed mine a few months ago.
www.avigex.ca/xport/d1977a.jpg

Much easier if a 3.1 though: it is all in and around the distributor.
reading the codes can give some indication, although not always critical of the actual problem. IN any case, use this:
www.avigex.ca/xport/readingcodes.jpg

It is the 3800