Dont count on me on this one as i do not know for a fact if spark plugs will adversly affect the idling. Just a suggestion, before when I had the STILLEN sc I was running stock spark plugs also and had major idling issues, wayyyyy worse than what you're experiencing.
GTM did installed some HKS spark plugs on my car when I switched kits. Now I don't have any idling issues at all!
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