Surge

So i had a post about a miss, when driving it would mis at any rpm i was cruising at, but didnt notice a miss when in nuetral or park, so i checked fuel, regulator on 6psi, floar levels were way high so i fixed that, set all idle screws 1 3/4 turns out, now when holding at a steady rpm it drops about 3-400 rpm then goes back up. Isnt that a sign of a vaccum leak? Video below.

[ame]https://m.youtube.com/watch?v=zASGvUPu10k[/ame]