Mine got noisy till i got pissed off at it and gave it a good thrashing and it went away. It came back again after about 2 weeks, so I blew the cobwebs out again and started driving it a little more aggressively and it hasn't come back. Also, I've learned to live with the little stumble at idle. If I could have my way with it it would have a lopey idle from big cams in it anyways