There are no garages that specialize in Nissan Tiida. Just take your car over to some garages in Sinaiyah, tell them of the problems of the car, and get their quotes. I guess your car has an automatic gear. Most mechanics, while they will give you surety, are not able to repair automatic gears. You may need to do a bit of running around Sinaiyah and check with the garage people. Ask them who specializes in automatic gear repairs. As for your car vibrating while travelling at over 100 kms, this is simply a case of front wheels balancing. Take your car over to any tyre shop and they will do the balancing at very nominal costs within 30 minutes.