[8lugnutz]

Mine did the same thing. One thing that I did notice on the old build was that one of my throttle return springs had fallen off, so I was only running on one spring. The accelerator would basically be on the floor and I'd either have to pull it back up with my toe or a quick tromp on the pedal to get it back to idle. Also, the throttle cable was a little sticky due to the PO twisting it to get it back on the linkage, so the cable was a little bit bigger (kind of like untwisting a rope, if that makes sense). I know there are two screws on the throttle linkage, one for idle and one for high idle, I had to bring up the idle. I'd check these few things first.

When I rebuilt mine last week, I put everything back exactly the way it was except hooking up the second spring and the straightening the cable back out and the it was sooo much better at idle. As far as the choke, you can loosen the three screws and rotate the choke to lean/richen the mix. Maybe it's too rich? I'm new to these carbs to, so I'd be interested in any other ideas.