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It likely has EFI (electronic fuel injection) and an idle air control valve that regulate idle speed. They can get gummed and fail to have a fast idle when cold, or get stuck the other way, and have a too fast idle all the or regularly take its time slowing down after you take your foot off the gas. An engine temp sensor can also cause a lingering high idle if it reports the engine as still being cold after warm up.
Sounds a whole lot like a dirty or malfuncitionig idle air control valve. A coil would generally show up as a miss under load or high rpm, crank sensors generally work or they dont, only sometimes giving you a miss, but that would be all the time at any rpm. Computer, I doubt for too many reasons to list. Could also be related to a bad throttle position sensor or a very slight vacuum leak.
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