Mine does the exact same thing, the car is super smooth at idle, but that same white-ish smoke comes from my exhaust to at cold idle. I've been told it's hydro-carbon, and that there may be small leak from the coolant, but when the engine heats up the crack producing the leak disappears. The funny thing is that I also have slight gas smell from the exhaust also. It sounds like I have the exact same problem. I just did a tune about 3 thousand miles ago, except I didn't replace my O2 sensors as well. Could this be a computer problem instead?
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