The increased idle that you mention at cold start-up is the ecu "waiting" (can't think of a better word, sorry) for a signal from the oxygen sensors. Once they've gone closed loop, the idle comes down. Usually only takes less than a minute. After that, it should be ok to give-'er!
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Andrew
2009 370Z Sport/Touring 6MT sold
2013 Honda Civic Si coupe D/D
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