The petrol variants of Fiat Grande Punto will be equipped with 1.2L, 1368cc, In-Line petrol engine that produces 120bhp power and offers mileage 12kmpl in city and 15kmpl on highway .... while the diesel variants of this car will be equipped with 1.3L, 1248cc, multijet diesel engine that produces 85bhp power....... for more details about this car along with its prices in your city you may visit the following link .... Fiat Grande Punto
Sir, if all the engineers are saying that there is a problem in Punto than they might be right, then you should test another Punto in same variant for that problem. If you feel the same problem in the other car also than the engineers are right. But if you won't found the sane in test vehicle, then there Might be a problem with your tyre or wheel or it might be a problem in suspension system. If the problem is with tyre, then it is a regular problem. But you are saying that the problem appears when it just jumps over a bump. By this, it is sounding as a problem with suspension system.