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at idle ,intake vacuum flutter is bad .
at hot idle
any flutter in the vacuum gauge needle is bad
it may be related to the engine speed of 250 rpm ?
retest ;
at around 700 rpm , if there is still flutter you have a valve sealing problem
does your car have EGR ? if yes , have a look with your eyeballs and make sure it opens around 2k rpm , if it does , your intake vacuum should be
lower than 22"
if EGR does open , your passages are clogged .
disregard this if you do not have EGR
and quick quick
translation of inches of mercury to PSI is 2 to 1
30"hg = 15psi , more or less so
15"hg = 7.5 psi more or less
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