Asynch will fire both injectors. For asynch at idle look at AE and stall saver. The Corvair has low vacuum so if there's enough of a change that the ecm thinks the engine's loading up, it might call for AE. Or if there's enough of a surge in idle speed the stall saver might become active. Stall saver usually comes with a bunch of spark advance as well so use that as a clue. I don't believe asynch is ever always on. I think the checkbox allows or prevents asynch at idle. Have you got a mask / cal and maybe I can look through code??
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