I'm replacing the junk weber 34 that came on my yj when I bought it a few months back. My question is: what's up with the air injection lines that weber says to hook up but are not currently on my existing carb? I've seen installs with and without then tied into the top of the air cleaner but can't find anything explaining why. The haynes book is useless in this since the stock carb is long gone. I've found multiple vacuum line schematics and they are all different. If I had done the original install I'd know. It may be useful to point out this is my first Jeep so I'm already unfamiliar with it under the hood.