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How long have you owned this car? Reason I ask is that it will idle high sometimes if the ambient temperature is cooler. On warm days, mine will idle high for 1 minute on cold startup and then drop down to 850. But on cooler days it may stay at fast idle for quite a while until dropping down. I'm just wondering if this is normal behavior that you might not be used to or if something is actually wrong.
You say that when you drive it and it warms up fully, it will drop down to normal idle speed. Does it ever come back up during that run or does it stay at normal speed? I'm not suspecting any grounding issues, although it's not impossible... But I'm wondering if this might just be normal behavior.
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