Vibration with engine on

I have 1.6EL '99 auto with about 94K clicks on it. Since last year, more so during winter, I am feeling quite intense vibration in the front end of the vehicle. I have got the IAC Valve, ECU and one of the transmission mount changed. It did not do any good. Have shown it at the dealership too. They are quite clueless as to why the vibration persists.

I will appreciate it if you can throw some light on the cause. I have the heat shields removed.

Jaideep

its kinda hard to find where vibrations come from but first thing to check might be all ur engine mounts make sure they look in pretty good condition. did u ever overheat the engine?