I honestly am not aware of the Renix TB setup, but if it's anything like the HO setup....... The adjuster will not do anything more than increase or decrease the idle by adjusting the position of the butterfly.
If yours ran fine then one day started to not idle so nicely, there is more than likely a issue that is causing the problem. That problem would need to be adressed. I want to say that it should idle at around 800 rpm in N and about 500 rpm in gear.
Are you having issues with it not idling correctly?
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