I did a little checking on my Webers this week but the batteries were dead so I couldn't fire it up. I removed the idle mixture screws and the air correction screws to spray some carb cleaner in the holes and clean things up a bit. There wasn't much build up at all but I did notice the air correction screws are all nearly bottomed out. Is that a normal setting? Last time I checked with my synchrometer the throats are all balanced very well.
The idle mixture screws are also nearly all the way out, maybe one turn in on each cylinder.