The car accelerates slow. It seems normal for regular city driving but if I need to accelerate quickly (pulling out into traffic) it is slow. It is as though there is no difference between when the pedal is half way down or all the way down. Also, if I am on the highway and go to pass it does not kick down. It will accelerate to high speeds but do it slowly. What could this be? O2 sensor? Or what about linkage--I do not put very many miles on the car and the linkage could get sticky I suppose? Any ideas? Thank You