I'm suspecting a vacuum leak on my '04 SVT....idle speed keeps wanting to stay too high. However, viewing the engine from the top, I'm not seeing any vacuum lines. Can someone direct me to where any may be that would affect the idle speed? I've reinstalled the tune several times, but this doesn't seem to affect the idle speed. I found the intake snorkle wasn't directing air into the airbox intake area, so redirected that and thought it made a difference, but have since decided that wasn't the culprit.