Hello

Can somebody educate me on "intake manifold vacuum"
I'm reading at idle 14.5 in Hg
Can this cause hesitation on an 87 Vanagon?
To my knowledge I should have 19-20 in Hg will bad compression or
compression imbalance cause the vacuum to be less.
Cylinder #1 155
Cylinder #2 175
Cylinder #3 132
Cylinder #4 165

Thank you
Kai

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