OK- just visited the rig at the auto shop. Some new information has come to light:
-removed fuel line to carb, cranked. Fuel in the mason jar looks good. Ruling out dirty tank, pump or filter issues.
-car starts a little slow with choke, but idles pretty damn well, even without choke! When I drive it, it lugs like crazy, dies at stops. Slow to restart, but will continue like that. So...idles fine but dies when moving.
-mechanic ruled out intake manifold leak, thought it looked tight. But didn't do a real exam.
The mechanic had put a new cap and rotor on, along with new plugs (x2) and wires. He said the points are therefore good. He also said they checked out the extra jets in the carb and they are huge, so didn't change the jets.
This is making him think the carb is the issue- needs rebuilding or something else. Again, this is a 6-month old City Racer- is it possible it's in need of rebuilding?
I took video; if someone can tell me how to post I will.