Why Does my RPM go up And Down While Driving?

A car engine’s RPM (crankshaft revolutions per minute) measures how much strain the engine is experiencing. The reason for this increased RPM is any of the following:

• Spark plugs are worn 
• Vacuum leak 
• Idle air control valve doesn’t work 
• Throttle pedal position sensor doesn’t work 
• Fuel injector is dirty 
• Transmission is having issues 

Some of these issues are quick and easy fixes, like spark plugs needing to be replaced. Deeper issues with your transmission system may require more work to be done to get to the bottom of the issue. Any of these reasons are why it’s important to take your car to an auto shop as soon as you notice weird fluctuations in your car’s RPM. 

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