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I just installed a new vacuum relay on the passenger side because the old one was getting slower and slower til it was taking 10 to 15 minuites for it to go down. Since, I installed new relay I checked vacuum at intake it was between 16-17hg the vacuum at the relay was about 1hg less. The passenger light is still comming up slower about 1-3 minutes on the upside and about 3-5 minutes on the downside could it be the actuator?
Ended up replacing everything; valves, hoses, actuators, under-dash service valves, check valve, filter..blah.blah. the handheld vacuum tester will tell you where the problem is.
i'm getting 12 hg off the manifold and lights/wipers are pretty much instantaneous. you must have a leak somewhere. probably the actuators.