My car makes a roaring/rumbling sound between 50-60 MPH is very irritating. Everytime I take the vehicle in they tell me they can not duplicate the problem?? The last time I took it in , I was told it was probably the tires. If it was the tires why did it happen when it was new ?? It seems to me like it is a leak in the intake manifold. This vehicle is 4WD in case that makes a difference.