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intake vacuum flutter is bad at any rpm
expect
18 to 21 " at hot idle
18 to 22" at 2k rpm
18" with EGR open
22" with no EGR or EGR not open
0" at WOT 25" at decel following WOT snap .
but
the single most important intake vacuum measured value is
steadiness / smoothness , if there is flutter in the intake vacuum
you have a leaking valve and that is never good
sometimes
at low RPM valve overlap will cause flutter
so
what is your intake vacuum value at 750 rpm , is there flutter or is it smooth
the answer
will let you know if your engine has problems , or not .
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