When the engine is not producing sufficient vacuum, the vacuum canister must supply the needed vacuum as you stated, There must be a vacuum leak in the system that the canister can not overcome. You can isolate each component in the system and using a hand held vacuum pump test each component. Usually you will find a split in a vacuum line where it connects to a component.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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