So, my cd player that I had in the Blazer I finally decided to put into the sedan so I can plug my phone into it. Keep in mind I threw it in the GTP temporarily for kicks, and in both it worked perfectly (like it should). I put it into the sedan with the same wiring harness, and it just kinda flickered a few lights, and wouldnt power on. I kinda shoved it back in a little and it worked. Moved it again and it didn't. I figured out that when the antenna end was touching the housing it would work. I wasn't going to plug in the antenna because I don't listen to the radio, but I plugged it in and viola! It now works perfectly. I guess I just don't get why it would do this short of having a bad ground, but the factory deck worked perfectly Also, the GTP was being screwy with the new one, but I think that's to do with the wiring harness before I fixed some crappy connections.