What causes car to shake when in drive but at a stop?

A car may shake when in drive but at a stop due to several potential issues. Common causes include engine misfires, which can result from faulty spark plugs or ignition coils, or problems with the fuel system. Additionally, issues with the transmission or mounts that support the engine can lead to vibrations. It's advisable to have the vehicle inspected by a mechanic to diagnose and address the underlying problem.