Hi Mike, and welcome! Really, really nice looking wagon. Good score! And I love the picture in front of the mural. Sort of the opposite effect that this guy creates: http://petapixel.com/2013/10/14/life-like-miniature-scenes-shot-using-model-cars-forced-perspective-250-ps/
Based on your pictures, I'd say you are much more familiar with 240s than I, even though I've been driving the things for more than 10 years. So I can't offer much.
Only thing I'd suggest, based on you saying it behaves like a vacuum leak, is to pinch closed the vac line to the brake booster. Faulty booster or check valve.
That said though, I'd think a vacuum leak would cause the idle to run a bit high. But checking only takes a second. Well, maybe 5 seconds..
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-Matt I ♥ my ♂
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