it sounds pretty bad and when its at a stand still it shakes.. then when it drives its ok until i try to get past 30. then it just won't go faster. i push down on the gas and the RPM dial will go up to like 8 or 9 before it finally kicks and speeds up. my car is a 200 Mercury sable. automatic. i was just wondering if its like something wrong with the gears or something completely different.