I have the tune and use 93. I sometimes get a very rough idle on starts, more often on rainy days. The code it throws is a misfire code, which it classifies as premature.
I usually clear these, but I know in the long-run it probably isn't good.
I was planning on upgrading the the race tune soon and hoping it goes away.
Once it warms up I have no problems idling at traffic lights, etc.