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I've been meaning to write back for some time.
The last thing that I replaced was the climate control check valve and the associated 3/8 inch hose to the intake. It took care of the whoosh/hiss under acceleration and on shutdown (a symptom that I failed to report in my original post).
I'm pretty happy with the idle now. The weird rising idle is gone and it is consistent around 800 rpm.
The remaining oddity is that the rpms still decrease slowly between 1000 and 800 when I put the clutch in. I'll mull that one over and start a new thread if I can't figure it out.
Thanks Trevor and Phil!
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