Given the attitude you got on the phone I would certainly NOT take it to that Chevy dealership. Start with a battery - they can test good but still not hold a charge. Your battery is at least three years old at this point. Once the battery is replaced then see what happens.I'm trying to figure out if I should take it to the Dealership to fix all these issues or try to do them on my own. From what I'm getting out of the codes I need a new PVC cover, battery, and new wiring.