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If you use 100% of your throttle to get full load to the engine your intake vacuum should approach zero. Conversely, if the throttle is not being used to put a load on the engine you should see close to the maximum vacuum you normally read like when you are at an idle coasting down a hill. Many throttle plates are not linear. A small movement from zero may be a larger movement of the throttle plate at the beginning than at 2/3 to full throttle.
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