Why does my carโ€™s rpm go up and down when iโ€™m driving at the same speed? Fluctuating rpm when driving at a steady speed is usually caused by an. Webaug 6, 2022ย ยท there are a few things you can do if your rpm fluctuates while driving so the first thing you have to do is make your car idle, that is, make your engine run while.

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