I don't think the Zetec is supose to shake. That is not normal operation of our engines. I have the 98 with VCT. 2 things I've done that has helped alot.
1. Front rear motor mounts, they cost 11 bucks for the rubber inserts and can be done by the DIYer.
2. Follow the PCV line to the back side of the engine where it goes back into rubberline and connects to the intake man. This line gets soft and will flatten, clampping off the draw.
After finding those 2 things my engine is damn near shake free. Before, I could feel my face vibrating with the rest of the car.
