hey guys Im new to the forum and i hope this is in the right place. Well i own an 2004 350z. i recently bought the car and starting to regret it. the engine blew up on me within a few weeks of owning it i contacted the guy i purchased it from and the engine was swapped after picking up the car from the shop i took it home to do some work to it i installed an nrg short hub and quick release system with a grip royal wheel and a harness bar. I have seating waiting to be installed and harness also coilovers. Here is the issue after doing all the modifications the car drove great for about an hour AKA the drive to the restaurant to eat, once we finished and tried to leave car wouldn't start almost as if its the wrong key i went online and here a lot of people talking about the nats antenna but I have no idea. I hope someone knows whats going on.