My trans am is also having some "system-wide" problems. Doing some searching, I found some things that suggested that these types of problems have to do with the "Body Control Module", which controls a lot of different electrical components in your car.
Take a look at this link, it's a bunch of selected Q&As from this site.
Search for Body Control Module and you'll see what I mean.
Saturday, January 24th, 2009 AT 11:30 PM