Are you reffering to your engine giving jerks... if yes then there is nothing wrong with your car tunning etc... the only issues is any one or all of your engine mountings are weak... get them replaced and this jerking will vanish... this work will cost you somewhere around 10-12K.
High quality of fuel will also help you but it's not a permanent solution.
And if you are talking about engine knocking on initial acceleration then only thing that can help you is hi-octain fuel.