Last night I got an engine light with P0299 Underboost. The max I would boost is 4psi. I have a Vermont tune. I cleared the code and restarted and now am boosting normal. This morning I had to go out so going to the store I drove my Cruze hard trying to get the code back and it drove great. Any ideas on what might have went on. I was going to go to the dealer this week but without the code I wasn't going to go.