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RPM stand for Revolutions per Minute and relates to the frequency in which the crankshaft is turning inside of the engine. The crankshaft turns as long as the engine is running and when the engines runs faster the RPM will also increase. As the car increases speed to change gears the engine will increase RPM until it is ready for the next gear. Just like on your bicycle when you shift up or down your leg rotation speed changes in direct proportion to how hard it is to pedal.

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Q: Why does your RPM gauge go up and down in your Chevy?
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