why does my rpm go up and down?

How to repair Bad Idle Speed problem in car. RPM go up and down

When your RPM fluctuates while accelerating, it’s generally due to a problem with the idle air control valve, or IAC, in your automobile. … Oftentimes, when there is a problem with the idle control valve and you’re noticing RPM fluctuation, it’s usually from communication issues.

Engine Revving Up and Down at Idle FIXED

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