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Don't listen to him. Any car will idle high when they're cold. It will always take a bit of time to get to regular operating temperatures.
Exactly. Cold means not operating temperature. The OP mentioned that he was in California and not very cold. However, 70 degrees is very different than a normal operating temp of 200 degrees. The car will idle high for a while even at mild ambiant temps, though it may idle high longer at lower temps (takes longer to get to operating temp).
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