Dear Blindboy,
Hope you're well. Thanks for your comments. What I don't understand is why the idle rate rises as the engine's temperature goes from "cold" to normal.
If un-metered air is the problem, that should lead to a high idle rate from start-up. That's not so here: it takes a few minutes from start-up for the idle rate to rise from 800-900 to 1,500.
By the way, is the hose - to which you refer - the main air intake hose? I inspected that hose: it seems to be in fine shape.
Yours faithfully,
Spook
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