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My Evo X used to do this a lot prior to getting tuned. The way the dealership would address is a reflash and it would go away for a while, but would come back in a few months.. and it was way worse than that ... if you have time, try looking up Evo X idle issues 2008 in youtube.. someone has to have posted something .. literally would bounce from 700-1000 at a very fast pace ... in the end, i wouldnt worry about it.. have it documented at the dealership (which you did) and see if they come out with any fixes ..
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