Running up and down sounds like a vacuum leak, check all your lines. Could also be a sticking idle control valve.
I also think I remember something with these older preludes about some coolant leaking into the throttle body and gumming it up. I think there was a recall or something, but just clean out the throttle body good and see if that helps.
I remember that hot engine refuses to start problem, too. I think it had something to do with the cold start injector or something simple. Wish hondaprelude.com was still around, all this stuff was posted on there!
I'll try to remember...
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