I haven't found a single vacuum line that is worthless on this car, they control things like the warm air intake, fuel cut off while coasting in gear, cold start enrichment and are part of how it ended up getting over 50mpg because they are part of the system that helps to regulate the lean burn and it's not hard to repair or replace the hoses, there is a sticker on the underside of the hood that maps them all out clearly.
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