I checked the air flow diagram for the HIC ... I don't see any other inlet for a vacuum leak other than the stack ... manual recommends plugging it with a pencil for testing, or when sitting idle mixture on an engine hot enough to open the HIC.
So a rubber plug on that stack doesn't accomplish the same thing as plugging the orifice of the HIC ? Although I guess a good backfire might blow the cap off ... but engine shouldn't be bothered digesting a little rubber plug.
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