Went to buy the part, turns out no one makes it. I have to have it ordered from GM. So when I was at the store I ran an OBD2 scan, which was a much more thorough one than the previous one I was lent. It said large and small leak, so I will just have to wait until I can get enough money to have it pressure tested. I know it is going to probably be the Purge Solenoid on the exhaust manifold or the charcoal canister. I have full boat warranty, just need a $100 deductible.