problem car stay running after key is remove from the switch
 

have a cobalt ss 2007 supercharger and sometime when i shutoff the car key off and remove the key... the car stay running wtf? what can do that is my third time the car do that..,

While I have never had this issues, I would imagine it is an ignition problem, it will most likely need to be replace.

sounds like a defective ignition switch to me.

I'd look into replacing it.