I'm in the same boat. I have an '09 G37 which two weeks ago started bucking, then stopped and hasn't resurfaced. Then yesterday, I fuel up and then gas gauge drops to zero as I pull away and a bunch of alarm lights appear on the dash. As I'm driving, the gas gauge finally gets up to where it needs to be and all the other dash light alarms disappear. I then pull into my driveway check engine light is on. Awesome. Thinking EVAP system prob, but just ordered an ODB adapter to see what it's spitting out, if it even helps.
So, any N. Jersey Mechanic recommendations would be excellent!