[1QuickS]

Check out the list of things to check in my posting dated 3Nov, titled "Weber remanufacturing". I use a Gunsen "ColorTune" to get idle mixtures spot-on after setting air flows correctly. Check for o-rings missing or cracked on your idle mixture screws and idle jet jolders.

The ColorTune allows you to watch the combustion in each cylinder so you can isolate where your issues are.

The IDT's have a leaner progression circuit than the IDAs do. In particular toward the transition from progression circuit to main circuit. Richer idle jets help at the expense of a rich lower end. Changing the size of the idle circuit air correction jet can fatten up the progression circuit at the top end but you need to do a little bench modification work. I can discuss this if you like.