Why does my car engine rev up and down? It revs up and down all the way up to 3x rpm and down?

Also when i step on the gas pedal it revs up all the way to the top 8x rpm and stays right there even when i let go of the gas pedal. Please anyone who can tell me why this happens?

This is a 1995 honda civic by the way

I had this happen to me on a Pontiac many years ago. The cruise control cables had gotten tangled in with the accelerator cable. It was doing weird things - scary things! After we got the cables untangled everything was back to normal.

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