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I would imagine that a vacuum line has been routed into a loop? Or something has been linked in conflicting directions which gives you the 10 second delay until it engages again. Check vacuum fittings (Y and + shaped)
Do you have a yellow vacuum valve on/near the firewall? It's a 1:3 connection, I believe. Originates from the brake booster line and into the yellow valve, and then into the firewall via a brown, red or green (with yellow) line. Not sure if it's exactly the same but I would imagine it's similar.
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