I would figure the surging idle is from the port job. That's how mine was. Actually both the last two times I've replaced the engine I've gone to a bigger port than before and each time it hunted for idle. If it's the same for you, I believe the tune itself should take care of it, maybe some minor adjustments to the idle screw also (if you have one, not sure how idle adjustments are set up for the RX-8).
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