I have a 2004 srx v8 northstar eng. I just replace my pvc lines cause it was a hole in one of them (rear back of eng ). First I was getting a engine light come on and high idling after driving for a while. The code was something with a vacuum leak, so fixing the the pvc lines I notice that the eng light went off and haven't came back on . But yesterday got the high idle again. What should I look for now to fix this issue?