Originally posted by tw0wheelin:
Could be the idler pulley as you mentioned but mine turned out to be the material in the precats had broken up and was rattling around inside the manifold.
Wouldn't that be really bad!!??! Stuff in the intake=bad. It could be that, but I would think that it would have a different kind of rattle, more of an intermittent one. Mine had that rotational rattle sound. And you're right, it is a 3/8 breaker bar.
