Ever sinceI got the car a few months back the accelerator pedal is stiff. It takes a good amount of force to get it up to a good RPM but also I could have the pedal to the metal and the car still would not to going faster. An example of this is when I am going on the highway and I need a little more speed. I have my pedal pushed to the floor But I am not going any faster. Anyone familiar with this problem?