So it started when I got off work this morning and went outside and started my car and waited on my gf to come out. I was idling for about 5 minutes and still she hasn't come out so I decide to get out with car running and just glance back to see if she's coming and she isn't so I go back in the car and it has shut off! I go to turn it back on and it takes a few seconds longer than normal to start but it does. Seems to be running fine but the damn CEL is on. She finally gets there and I contact OnStar and they run the remote GM diagnostics test and say something along the lines of powertrain control module...blah blah blah...engine control system. Something along those lines. Anyways I get them to set me up an appointment with my dealer and I go back home. It's running fine all the way home but since its so humid I need some defrosting done. I turn on the a/c and just more fog on the window. No cold air at all! CEL and A/C fried?!?!? WTF?! I get home and cut it off and wait a min or so and try to start it. No Luck. Does nothing. Try several more times and it just won't start. Well after a few more tries it finally does but still a CEL and no A/C. I go in to get some rest and it's time to go to the dealer. Go out start it up and everythings back to normal CEL gone and A/C just as cold as ever! Drive it to fill it up and everything is like nothing happened so I didn't go to the dealer cause there is CEl for them to test. Anyways has anyone else has something like this happen and did it happen again?