my evo just started this odd sound, when in neutral with the clutch out and hit the gas at around 2000rpm's it knock's lightly then goes away, when the clutch is in there is no sound at all, is it something simple as a loose bolt, or like a throwout bearing, or clutch adjustment or even worse?! it just got the clutch about 8 mos ago and only been to 2 races since, and 0 launches, any idea or anyone in the area to help? it also sounds slightly like something is rattling like a sqeeky kinda rattle sound? sorry its hard to explain but any help and i can try to get a video tomorrow? thanks sorry i searched and couldnt find anything like this.