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It's supposed to do that. It is the "dash pot" emulating putting your foot on the accelerator to start the car. The computer does all that for you. Keeps stupid people from flooding the engine out. That is your "dashpot" at work. It's supposed to "rev up" and then calm back down. It imitates putting your foot on the accelerator

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Q: Why does engine rev up on your focus after starting could it be throttle body problems?
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