NewAge - same thing happened to me. Did you go into "Limp Mode"? We are prob similar with garaged cars not daily driven, as there are parasitic losses constantly sucking on the battery. I also am STILL on my original battery. After alot of research, I found there are are number of things that can cause this. Long story short, a new battery and or connections are the key culprits. Esp the harness connection at the throttle body. A code reader like the SCT X4 is a great tool to eliminate any guess work on codes and clearing them on the fly, or a trip to O'Rileys to read what the code is and a charge test on the battery will avoid guess work.
https://www.camaro5.com/forums/showthread.php?t=532978