So I've got the carbed sync'd pretty well. I understand the process fairly well, was able to sync each barrell, then each carb between banks, and then each bank. Everything is flowing, according to my syncrometer (STE SK1), at 7 kg/hr +/- 1/2 kg/hr. I know that this seem high. Idle is fairly smooth and steady at 1000rpm. I've adjusted the idle mixture screws and am fairly confident that each is in the "range" of contributing to highest RPM, although where in that range I don't know (probably need to get a colortune). So, the symptoms that I know are not good: ** 1. High airflow rate: 7 kg/hr for each barrell ** 2. When I "goose" the throttle, and then release it, the RPMs continue to climb even after I've released the throttle, and are very slow to come back down (Maybe takes five seconds to return to normal) ** 3. When I spray starter fluid at the carb bases (right on the insulator gaskets), the RPMs rise significantly (maybe 500rpm). Each carb appeared to exhibit this behavior. NO WAY! I just had these rebuilt by Pierce Manifolds. There is NO WAY that I can have an air leak?? They straightened the carbs so that they were true, and every gasket is new in the thing. For each carb, I used ONE 3mm thick black plastic base gasket piece, with very thin (1/3mm) light brown colored, pattern-printed factory gasket on either side of it. There were four additional regular 2/3mm thick gaskets, part of the rebuild kit which I did not use; they weren't on before and don't show up in the parts manual. So, either I put them on the intake manifold wrong, over- or under-torqued the carb nuts, didn't use the proper intake manifold <--> carb gaskets, or Pierce Manifolds rebuilt me some leaky carburettors. Any ideas?