replaced dead battery now the car starts then dies. Anti-theft?

yes sir, battery section didn't discuss replacement or my scenario specifically but still looking. Does appear to be an electronic module issue but which one or how to reboot still eludes me. I have just got back from meeting the tow truck and i had disconnected the battery, i tried reconnecting the battery while the key was in the ignition but it didnt work (stay running). I disconnected the ground again (which seems like not the best idea from what I have been reading) when the tow truck showed up i needed to put the car in neutral so the ground cable went back on, as i fidgeted the key back into the ignition I put it back in then out then it fired up and remained running, so i dont really know what sequence if any fixed it. I'm also getting a check engine light on now which i did not have before but of course I have no code (something that needs reset most likely). Sure wish I'd bought a muscle car instead of a computer. Having to be "booted up" and endless power supplies wasn't on my wish list. thx :-)

Yeah , there's something to be said for old-fashioned points and carburetors! Good luck.