car shakes on 1991 BMW 535i

The car just started shaking like it's kinds floating on the road?

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1 answer
Check the rear shocks, if it has large spherical black units attached to the shocks, they commonly fail internally and require replacing. You are able to replace it with a new NORMAL shock without the round unit, should be better but you need to buy a shock and spring.
Also check the bushes
Goodluck