Sorry for the wall of text, but I'm stumped here. I'll give you a little background. Car is a 2004 Z06.
Wednesday the 7th: Started my car to move it out of my garage before work (detached garage). Started just fine, only moved it about 50 feet to a parking spot in front of my apartment. This was at 9am. Fast forward to 1pm. I go to get in to head to work. Turn the key, nothing. As soon as I turn the key over, all the lights and the stereo go black. As soon as I release the key, everything pops back on. I tried 3 or 4 more times and still nothing.
I pop the hood and check for a loose connection real quick, didn't see anything obvious. Said screw it and tried it one more time. The car started to turn over, would kind of cough around 600 rpms, then shut off. At this point I was out of time and had to go to work so I said screw it. I left it in my parking lot.
1030PM, same night, I get home from work. Figured I'd try again. Car fires right up. No issues, no hesitation, everythings fine. I'm stumped. Pull it into the garage and go to bed.
Saturday the 10th: Was about to head to the bar around 10PM. Walked to the garage, car fired right up. No issues. I let it idle for about 10 minutes. Everything was fine. Drove it to the bar.
2am, same night. Walk out of the bar, turn the key, nothing. Same issue. Turn the key all the way, everything shuts off. I'm pissed because it's 2 am and now my car won't start. Sit there for a few trying to think what it could be.. Decided to try a few more times. Turn the key, car fires up.
This time, it sits about 1000 rpms and violently shakes back and forth for about 20 seconds then goes to its normal idle. Drove it home, haven't touched it since.
Any ideas?? I am totally stumped. I have 0 time to work on this thing any time soon with school and work. I'd pay somebody but that will cost a fortune. Kinda pissed because it's about to be good driving weather.
Really appreciate any help. Sorry for the long story.