well as far as i know, all of my vac lines r hooked up, and i just bought a new engine coolant sensor, so we will see how that goes. i once took off my intake mani, and put it back on, and im not to sure if the gasket was fully on right, it was a pain tryin to get the gasket from the lower plenum and block to seat right, so if i have a leak, im guessin it would be from there