Hi,
My first thought is too much intake air.
You know, missed a vacuum line and then the brake booster hose popped in my head.
Maybe it has cracked or split on you a tiny bit. It’s a big hose.
Vacuum hoses seem to crack on the underside or backside where you cannot see them!
If you completely pulled the intake far enough, to get it out of the way for better access to those hoses, you may have also done something to the check valve or it’s grommet too!
I had the little center disc plate completely fall out of one check valve after I happened to noticed it was looking dried out. Of course, that was on my 1978 several years ago.
All that stuff is old.
It’s like us older people that don’t care for excessive bone shuffling!
Especially, if things really start to suck! (:)
Phil
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