I have a 2002 RSX-S with about 75,000 miles on it. Recently I started to notice a "buzz" coming from the engine when it runs between ~3000 and 3500 rpms, and it happens in more than one gear. As soon as the car is put into another gear outside this range or neutral, the noise goes away. Does any one have any idea what might be causing this problem? Thanks for the help!