I have a 2012 chevy cruze with 100,000 miles. I have multiple engine codes thrown at me and I took it to a mechanic and he replaced my mass air flow sensor. after that I was on here reading the threads and I came to the conclusion that my pcv valve have a vacuum leak in my valve cover, therefore I replaced my valve cover with the built in pcv valve and now it is spitting out oil when I am driving and has another vacuum leak. could this be caused by my valve in my intake manifold? Please HELP!!! PS. there is a noticeable amount of oil leaking from the hose back to the turbo.