Idle Air Control mount fix by Toby Erkson
I began to notice what seemed like valve noise, like an air-cooled VW with big valve lash gaps. Sometimes I would hear a buzzing sound under the hood when I was coming close to redline. It turns out my IAC mount was broken, thus the IAC was just rattling on the valve cover. Once I fixed the mount all the sounds disappeared. However, it was simply by chance that I discovered it broken because I was under the hood to tighten my exhaust manifold and I happened to bump the IAC and it moved...and that didn't seem right. Luckily, it's a very easy fix if you have or know someone who has a welder.
After welding the bracket back together:
IAC bracket re-mounted:
IAC mounted and ready to go: