Have you adjusted the idle screw in at all on the new iacv? Yeah you need to warm it up and pull tps to set the idle but you could screw it in to lower the idle enough to get control of it so you can get it properly set.
Another common issues on the ka's is people get the dizzy a tooth off. Set your motor to tdc and restab the distributor. Get a timing light and aet your base timing. I had some issues with mine due to the dizzy being off a tooth when i bought mine.
When did the idle issue begin? Did you change anything around that time?
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