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when cruising, the vacuum gauge reads around 10-12
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that's a little low, could indicate over carbed, could also be a by-product of your camshaft profile.......
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- when I take my foot off of the accelerator, the gauge jumps up to around 20
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thats normal.......
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under hard acceleration, the gauge drops to around 5 and THIS is when it starts to sputter until it "catches its breath" so to speak and starts to accelerate again and the gauge goes back up to around 10-12
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gauge dropping to 5 or less is normal under hard acceleration, sputtering, I don't know, could be a number of little things, could be one or two things....but does sound like a temorary lean condition...
again, I've seen this on engines that were over carbed, it can be fixed,it'll just take some tuning and trying different things to work it out.....
BTW: normally, your idle vacum reading will be the same or very close to your cruise vacum reading.......
David