My iroc is slowly leaking oil. About a half quart every 2 or 3 weeks. What could cause this? What different gaskets could possibly need to be replaced?

 

First you should decide if it is actually leaking or just burning oil. If you notice oil stains on the ground where you park the car, there is probably a leak. If you have a leak you need to find out where it actually is, otherwise you wind up changing gasket and seals without fixing the leak.