You may have soaked the optispark distributor.
if you car shakes when its fully stopped it may be the harmonic balancer, take it to a garage. is it shakes only when you are braking while stopping than have you brakes checked
It sounds like you have water in your distributor or your spark plug leads are wet. Spray your motor electrics with a water dispersant.
Replace engine cushions
possible warped brake pads or warped rotor Shaking while stopped, can be caused by broken motor mount, or engine miss.
The Vehicle shakes because of the virbration produced by the engine at the stop sing
check the time on engine
engine rubber mounts or timin out
That's a misfire-ah....
Engine miss.
An automobile engine usually shakes when it is being revved due the crank rotation. When revved in neutral, a torque is produced due to the reaction of the motor.
My Honda civic 2002 shakes fora few seconds as I turn the engine off.It happened right after replacing the engine mount on the driver's side.
have you checked your motor mounts?