My SUV is Ford Escape 2001 model, and it seems as though it is always using a bit too much power than is needed and seems as though it is under a load. It does not run "smoothly" as some other cars i've driven. The RPM keeps going over 2.5 when tring to accelerate from around 20-80 kmh and up to 3 when accelerating after 20-0 kmh. It gives an average of 6 sometimes, when i use the highway a lot, it is 7. How do i fix these problems? Thanks for the time.