[Resolved]  Maruti Suzuki Zen Estilo VXi — high vibration and loose steering

There is a heavy vibration when travelling above 80 kmph, At speeds above 90 kmph, steering wheel becomes very loose and free. infact at higher speeds it should become rigid. very heavy vibration above 80 kmph, makes me afraid to drive the car. This complaint was made in 2007 Sep itself to Local dealer during I service M/s ABT cuindy Chennai. They claimed to have attended it.
But recently on a highway trip I face this unsual problem of heavy disturbing vibration and loose steering, . It makes driving a fearful experience and stressful.