Has anyone experienced their car's tachometer suddenly jumping above 3000 RPM and then dropping back down while driving?

Yes, it seems to be a common issue.

Yes, I've experienced the same issue. I noticed it a few days ago while driving on the highway. Sometimes, even when I press the accelerator, it just doesn't have the power to move. I brought this up during my last maintenance visit, and the mechanic said it's normal. I'm not sure if that's really true. [Feeling confused]