I drive a nissan primera car,the car doesn't drive smoothly on low speed like 0-40km/h,it will be as if the car is dancing but d steering is always stable.whenever i accelerate and acheive high speed,it drives smoothly.i went to do wheelbalancing and allignment to confirm which of the tyres is bad since vulcanizers could not give me the correct answers but the wheelbalancing result shows that none of the tyres is bad..I'm confused and the problem still exists..what i noticed is that the car is raised from shocks and some parts underneath the car is rusting.could that be the cause?pls,Gurus in the house,enlighten me.