Bill, the electric choke version has an idle adjust screw acting against a cam. But I assume John has a manual DGV type. Instead of an adjust screw and cam it has what they call a "Fast Idle Loose lever". See the dwg I linked above. From the dwg I cannot understand how it works. But I have a paper copy of this dwg that has a more complete description of each part. #55 is the "Fast Idle Control Rod" . It pulls up on #60, the "Fast Idle Loose lever". #59, 61, 62, 67, and 64 are all part of the "Loose lever assembly. Note that all these levers have round holes, so they float "loose" on the throttle shaft. So I do not see how they can rotate the throttle shaft to increase idle speed. Unless maybe the wavy washer , #61, creates enough friction against washers #59 (with flat holes keyed to the shaft) to move the throttle. I have found nothing on line to describe how to adjust fast idle on a DGV manual choke version.
I am 90% sure that John's problem is that the "fast idle lever", is either not moving the throttle shaft at all or not rotating it far enough to get the idle speed up. But I do not know how it is supposed to work. If I am correct about the wavy washer and friction, maybe he has no wavy washer or maybe the assembly is too well oiled and has no friction.
Tom