Hello all gurus!

I have a 94 W124 200E (I know that is a rare engine configuration in the US) and i have just changed my timing belt, engine mounts and transmssion mount. I had the following items changed due to vibration i felt when the car is idling. Anyway I guess that it is due to be changed at about 130000km on my clock.

However, after having changed the following items, the vibration became worst! Please suggest what could be wrong! By the way i changed the spark plugs to iridium ones, does anyone encounter any problems using them? By the way is it OK for the engine pressure to drop to 1.5 or 2 when not accelerating?

Thanks!