Motor on 2001 Cadillac Seville

My motor shakes. When I stop or drive off my car starts jerking and oil is leaking from the valve gasket.

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1 answer
Sounds like two separate issues. The oil leak is something that should be addressed, but probably is not influencing the motor shaking.

Have the ignition components - down to the spark plugs - inspected for a possible misfire. There can be other reasons the car will "jerk" such as transmission issues, but based off of your description, I would look at plugs, coils, etc.