The base variant of Grande Punto is equipped with a 1.2L, 1172cc, FIRE petrol engine that offers great acceleration which enables it to cross the mark of 100kmph in just 14.5 seconds and achieve the top speed mark of 155kmph. The other three petrol variants of this model are equipped with a 1.4L, 1368cc, FIRE petrol engine that also offer excellent acceleration that enables it to cross the mark of 100kmph in just 10.9 seconds and achieve the top speed mark of 178kmph. Besides this, the diesel variants of Fiat Punto that comes with a 1.3L, 1248cc, Multijet, VGT (Variable Geometry Turbocharged) diesel engine offers good acceleration that makes it able to break the barrier of 100kmph in just 13.6 seconds and touch the top speed mark of 165kmph.
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.