I like to work on my 2004 Pontiac Grand Am a lot, and sometimes I need to leave it running in my garage to make sure I don't mess something in the engine up, and I was wondering if I could get carbon monoxide poisoning from that? I know it has a catalytic converter in it, but is it still safe to run the car even with a catalytic converter, sometimes I take a good 3 hours out of my day to mess with it if that says anything