My cars (2003 Honda accord EX 4 cyl) RPM is really low when my car is idle and makes my car shake?

When driving the RPM will also lock up or drop low randomly and make my car shake, like it doesn't want to go. Yesterday I was on the highway and the RPM was stuck barely above 2,000 when I was going almost 75-80 MPH which is usually at almost 3,000. It felt like my car didn't want to go much faster than that.

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