I replaced my lower intake manifold gaskets new air cleaner oil antifreeze put all back together and now I here a vacuum noise as if something were unplugged passenger side of engine but car runs awesome no misses no issues other than I can here that vacuum noise coming from the engine haven't been able to figure it out still feeling around all over the engine for disconnected vacuum lines.And disconnecting vacuum lines to see if there is a difference any suggestions.?

 

You can carefully (on a cold engine) start it and spray carb/choke cleaner around the side you are hearing the noise and listen for the idle to change (old school trick)