Pete,

Thanks. I'll try those. I do have a Mity-Vac and I've been using it a bunch. I did replace that restrictor, along with the 5-way rubber fitting a couple of months ago. But checking that restrictor for plugging is a good idea. I did check the vacuum off that nipple and it was really low (5" or so). I have already replaced a bunch of the rubber in there. But I'm going to the parts place tomorrow and getting a liberal supply of the hose. I had a lot of problems with the rubber on my 82 SD as well, making me a believer in wholesale replacement of rubber.
But I AM going to get enough vacuum hose to bring the Mity-Vac into the car with me so I can really see what's going on. I'll let you know how it goes.

- Ted

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1987 300SDL 265,000 mi.
1982 300SD 325,000 mi. (and holding)
1956 Packard Clipper 150,000 mi.