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Mine also idles a little high when starting in the morning. It doesnt seem to be affected by ambient air temp as much as the fact that it's been sitting for a long time/ overnight. The rest of the day it idles normal rpm or even a little under. Know that doesn't help with the code/ evap can deal. Wonder if you could've gotten some moisture into the intake. If no signifigant mods (that would prevent warranty coverage)...I would see what the dealership says. Maybe there is a TSB that applies to your issue as well. JMO
 
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