My vacuum goes up to 23 solid while cruising 2000 to 4000rpm?

man

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only dives to 15 when throttle is jumped on and normalizes around 19 while at idle
Give me a run down on what this means about my engine?
Good bad normal etc?
19 idle 23 cruise 15 at full throtle accel
 
gears in - rpm's - top end - pumping air in - 1800 is normal top end - go A to B - C is junk yard or ...
 
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