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Many possibilities. I would start with wheels, and take it to a well equipped tire dealer. Have them check that the wheels and rims are clean, properly torqued. Spin the wheels up to speed and check for dynamic wheel balance. Check for broken radial belts. Check for recalls on your tires. Check for driveshaft and universal joint damage/ balance.
Major transmission problem. That's what the flashing Check Engine light means.
If the Check Engine light is on all the time, it means there is a "fault code" stored in the computer. Take it to an auto parts store (like Auto Zone) and ask them to read the codes to see what it says. They should do it for free. If they won't, go to another auto parts store.
If the engine is misfiring and that is the source of the shaking then the check engine light will be flashing like crazy, other wise it is not the engine causing this, I know was a Ford tech for 25 years.