OK, so car runs fine the 9 months that I've owned it. All of a sudden, it won't start one morning. It turns over just fine and fires. It runs for a split second and then dies. If I give it gas at just the right moment while turning it over, it will rev. It revs roughly. I slowly let off of the gas and when it gets to idle speed, it dies. From what I'm reading, I'm thinking EGR valve, but the codes it's giving me throw me off. I get the codes via the on, off, on, off, on method.

Code 12-Problem with the battery connection. Direct battery input to controller disconnected within the last 50 ignition key-on cycles

Code 77-Speed Control Power relay circuit is open or shorted.

Neither of these codes seem like they would affect the vehicle's idle, so if anyone can help with my problem, please do. This is the only vehicle that I have. I have 40 miles one way to work and have a wife and little girl depending on my paycheck, which I may not get any more of if I don't show up to work soon!!!