Car wouldn't start, waited 10 mintes then started

You don't have to guess about this,there is a way to inspect for Anti-Theft system problems. There are codes etc., take the Chevy to a shop that knows how to do this. It may be something else, like a crank sensor etc. No need to pay for some one guessing. http://repairpal.com/chevrolet-repair-in-beckemeyer-illinois

Try the gas cap first, better to waste 13 dollars, than hundreds, I too had same problem..you can order a gas cap from parts stores...

Try to start,if no start leave key in on position. Wait 10-12 minutes,turn key off for 5 seconds. Repeat 2 more times. Worked for my (crank but won't start issue). Has to reset "Anti=Theft" system.