i have an aftermarket deck. i want to put a cd changer underneath my passenger seat, but the stock amp is there. if i unhook the amp will i have to rewire anything? or will it just run off my deck power?

If you unhook your amp, then nothin will work. Your head unit is wired to work with the stock amp, so neither will be functional. You will , then have to run all new wires to each speaker location, or if you can get a wiring diagram of the wiring harness at the stock amp, you might be able to cut and butt the wires at the amps harness. I've never done this on theese cars, so don't really know if that method will work. If you really want a cd changer, find an alternate location for the changer, like in the hatch somewhere.