I am a new owner of a 92 325i, today I started the car, it started fine and I drove it for about 3 minutes, then I pull it into the garage. I started to mess with the AMP in the back and changed the location of the ground. Then I tried to start the car, it cranked, started then died immediatly. Ever since then it just cranks but doesn't ever start. I Put the AMP ground back to where it was and it still doesn't work. Any ideas what could have gone wrong? It's also slighty raining outside. What are some things I could check out? I am totally new to BMWs so please be as detailed as possible. THANKS!!