Well, I hope it works out Ok for you. I can only tell you that on my 89 Honda wagon it would not idle when it warmed up, it would hunt from 1500 - 0 and back. I blocked off the air inlet hose to the EACV and it idled like it should have. I purchased a used one, at the junkyard and it did not leak any air. When I installed it, the car idled properly. That was my experience, take it for what it's worth. $150, I'd be really ticked if it didn't work.
Why don't you try plugging off the air supply from the intake, temporarily and see if it will idle properly, before you change it out.
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