Q: Car runs badly

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Hi, I have a 2008 Tiburon GT 2.7. Sometimes when I turn it on the tachometer gauge goes to the 4 and stays on it. But the problem is not only there. When I drive the tachometer gauge keeps jumping even when my feet is not on the gas. Which part is the problem ?? Thank you

My car has 92270 miles.
My car has an automatic transmission.

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