Sunrise,
Welcome to the forum. Sorry to hear about your problems. You should still be under warranty and if your dealer isn't giving you satisfaction, maybe you should try another dealer, or find out who the area service rep is and start complaining LOUD. Keep all your receipts from previous dealer attempts to fix your car and show the rep his failed attempts. $6K loss for a trade-in on a 2003...wow!
Good luck.
Trade your GAMES & MOVIE DVD's at:
www.gametradingpost.net