I have a D15Z1 swapped CRX, and I've been having the same bouncy idle problem since I installed the new motor! I first suspected the IACV, but was unable to correct the problem by cleaning it, OR switching it out for another used one which was presumed to be working. I also noticed that the problem persisted with the IACV unplugged, although the range of RPM bounce decreased. Did you ever find the cause of your issue?
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