I got some of the warmup regulator and vacuum port functions explained to me in another thread. There is a green/white orifice that goes to the front port and it buffers the vacuum momentarily on acceleration. Might be worth checking. Did they share the system and control pressure readings with you?

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma