Okay so today I was driving around from about 2-3ish and I had some thing to do and I pick some people because we were going to a concert later. Anyway Chris forgot his ticket and we drive back to his house to get it. It is like 103 degrees outside, it was hot as balls. Anywho we pull into his neighborhood and about 10 feet from his house my car dies. Not just the engine shutting off no. It completely dies. Everything was dead, no lights, no radio the car wouldn't even try to turn over when I turned the key into the ignition, it was completely dead. So we rolled to a stop in front of his house and parked the car and I was really pleased. So anywho we take Chris's mom's 330 to the concert and then afterward my girlfriend brings me by Chris's house to get some stuff out of my car. I decide to try my car again and the power is back and the car works. I'm pretty happy so I hop in and drive about 10 feet and it like hiccups and loses power and then it comes right back on, so I drive a little bit more and its fine. I drive it to my girlfriends house and when I stop in the driveway it dies again. I'm thinking "goddammit" when it gets power again. So when I leave her house it starts fine and works all the way to my garage were it turns off normally.
I just had the damn thing looked at by United BMW and they said it was running great. Is the alternator going bad? I know the battery isn't dead. When the car dies its absolutely total, its like it has been hit by an EMP or something crazy. I'll see how it runs tommorrow. Anyone have any ideas?