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Why does my RPM go up and down while driving?
My car is acting weird lately. I’ll be driving normally and the RPM will be all over the place—even though I’m not changing anything! Why does my RPM go up and down while driving?
Brittni Brinn · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
That sounds worrying for sure! Here are some possible reasons your RPM is going up and down while driving:
- Worn-out spark plugs
- Vacuum leaks
- Bad idle air control valve
- Malfunctioning throttle pedal position sensor
- Dirty fuel injectors
- Issues with the transmission
If it’s something like worn-out spark plugs, it will be a quick fix. However, a fluctuating RPM could indicate that there’s a more serious problem with your fuel or transmission systems. It’s best to take your car to a mechanic as soon as you can so the problem doesn’t get worse.
Hopefully, you can get your car looked at soon!
View full answer
- Gregory R.
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