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Yes, the valve on the injection pump that has the top hose to transmission and bottom hose to the vacuum pump. There is a special gauge block to adjust the valve but you can make it yourself. Or just trial and error. I found a genuine AC Delco part on that website named after a South American...

Check the throttle vacuum valve. The purpose of this valve is to trick the TH400 into thinking it is behind a gasoline engine. At idle, you need 17" of mercury vacuum, dropping off to 0" at wide open throttle. A cheap vacuum gauge and a few assorted vacuum tees will go a long way to...