funny sound

[DavidH]

This is my first post, ive been reading the forums for only about a week now and decided to ask for some help. I drive a 98 Civic LX and when i am at lower RPMs, under 3Kish i get a strange sound. The best i can describe it is like a playing card in a bike tire. It just kind of clicks over and over, but if i rev the engine, it goes away. Friend told me it might be a cracked header, but i have NO idea what it is. Coudl anybody help me out here?

Thanks in advance, and GREAT site.

[Senshi]

well it could be that the ceremic in your cat. is broken, it could be that a valve is loose or something of that nature, it could be many things

[ebpda9]

i think it is the distributor.