I was on the highway boosting and then my motor sounded funny. Sounds like something is RATTLING. For example, a bracket mounted on the firewall and its loose and rattling against the firewall. The car is still hot, i'm waiting for it to cool down to see whats up.

At idle, it makes a very loud rattling. And idles at 1,000 rpm then drops to 750 rpm...then it stays like taht for a little bit then it just drops down to almost stalling out then jumps back up ...then jumps down and up and dies.

But if I rev it to 3k+, the noise dissapears.

Oh yeah, it boosts FINE too.

Do you think I bent a valve? I didn't misshift or anything either. Just redlined it in 3rd and then I was cruising and heard that noise.