My Mistubishi Pajero 3 ltr,petrol engine,When i want accelerate to the maximum speed at one go,the RPM goes to 2800 and then drops to 2200 and continues in 2200RPM with speed of approximately 60 to 70kmph, All cars overtake me on signals :(((( Can you suggest what is the solution?? I can accelerate the car to 180kmph but not all of a sudden,but gradually....Is this a problem?