Why does my car chassis bounce/vibrate rapidly?

I’m a little new to making chassis’s, I don’t know why but my car bounces/vibrates rapidly for some reason. Can anyone tell me why?

https://gyazo.com/467192f497fdea4852751349dac088ba

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I have no idea why this us happening, I would just try making there always be a velocity down. I have no idea about making cars, it’s just the only thing I can think of.