Lets check your readings again with another vacuum gauge, meanwhile resolve your CAS code and see if that resolves the problem, https://www.300zx-twinturbo.com/cgi-bin/manual.cgi?list=ef&slide=107 Here is the vacuum test from my 94TT, pardon the intermittent poor camera work and language...burned my finger :( https://1drv.ms/v/s!Aujsaw6oKjtRjFnZZkbbYTtVP8jM?e=MiyT23 See the difference? Your readings, provided the gauge is being accurate, would lend to a possible valve or ignition timing issue that would line up with a CAS trouble code.
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