"Gassy" machine????

so i hooked up my first semi-auto machine today. actually my first machine ever. its a refurbished 3 group 85 series la san marco.   my issue is that im getting air through my group heads when i turn any of them on. Ive tried everything that i know how to do, which obviously isnt much since im new at all the mechanical stuff...thats why im here.  any help will be greatly appreciated. thanks

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