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There are many threads in Search on hunting vacuum leaks. Most of the diagnostic/hunting is simple but tedious.Lots of hoses and connectors to carefully remove and inspect. Easy to miss things like a hairline crack. It requires a patient, systematic and thorough approach. Don't assume the first leak you find is the only one !
Find any Thread where replacing all the vac hoses with good quality(USA made) silicone hoses and brass fittings is discussed.Pressure test the Vac Accumulator. The dismantling is very time consuming but even more so is the re-do if you don't go through the entire system.YEMV.
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