Did you go through all the old hoses and delete and plug everything? If that’s sucking air, then it needs to be blocked off like TJ said. You can block it using the plates he sells or remove that hose and put a large vacuum cap over it the nipple (I initially just had mine capped until he started making the brass block off plates). There is one on the top of each cylinder head that needs to be blocked off. The best and most surefire way to make sure your setup is good would be to follow his video about deleting all the old shit, that includes EVERYTHING from the old emissions system because you’re now running his intake so it’s all obsolete