The iacv does so little on an sr20. In fact the power FC has some kind of bug that prevents it from even working properly and nobody ever seems to notice.
most of the idle air comes from the wax element thing where the water flows through it to warm it and bring down the idle.
And most of the "dying when coming to stop" problems are because of people not using recirculated bypass valves or proper MAF positioning and hoses
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