I have been having some trouble with my acceleration in my 96 LS auto (with 98k+ miles). It seems like it doesn't want to go like it used to, there is a serious lag in accerlation. I recently and a tune up (cap, rotor, plugs, wires, fuel filter), i also had my fuel induction cleaned out twice, and my timing has been adjusted. I have taken the car to two shops and they said that there is nothing showing up what is wrong with it. Can it be my O2 sensor in my exhaust? If you have any suggestions or questions feel free. Thank you.