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Check all vaccum lines going to coast-enricher. Actually, remove them all and pressure-test for leaks.
Disassemble the coast-enricher and verify centre port's tiny hole isn't clogged. Easy way to check is to attach longer hose and dunk it under water. Blow on other end and you should see plenty of bubbles. A single grain of sand getting in there can clog it.
Also check that spring-loaded diaphragm isn't ripped or leaking.
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