Did you ever get this to pass? I live in Portland, OR and they have DEQ emission testing in this county. My '84 4runner is a california emissions vehicle. It failed high carbon monoxide. Basically, unburned fuel. The little sheet they gave me said check...stuck choke, air/fuel mixture is too rich, smog pump, etc. I got a carburetor rebuild kit for $30, but I took one look at the directions and decided to return it and look into a weber carb. I want to know if it will pass though and just how tough it is to dial them in. I heard getting the jetting correct is tough.