Well I've got a new Accufab TB I'd like to install this week. I also have a new GM IAC thats been setting in the box for years, so I thought, why not use it. Now I've done my search and must say, the countless IAC threads are a bit overwhelming to say the least. I think I even read somewhere about the IAC haters club, yikes. Anyway before I get started, do I install the IAC right out of the box or is there any adjustment to the unit itself while it's in my hand?