The car always has high rpm power. The reason why is because my mechanic and I changed my timing belt on my car, and when we took of the head, it looked like it was dirty. I gues the women prior before never changed the oil at correct intervals. He thinks it is possible it might be clogged and not flowing correctly. He remembers reading it in a book but one of his friends took it from him. We want to take it out and just clean it but we want to make sure we have the correct procedures. I feel a surge around 4500 also.