Jalopypapa is right about inner cv joints. I replaced over a dozen in one summer. All different year models and mileages, but all but one were on the right side. New engine mounts can shift the position of the drivetrain. That will put the rollers inside the inner cv joints in different places which usually increases the shaking.
The big clue here is the shaking stops when you let off the gas. The reduced torque allows the rollers to move freely. Under load, they bind and cause the half shafts to push on suspension components which includes tugging on the steering linkage.
Caradiodoc
Friday, June 19th, 2009 AT 9:43 PM