Technical issue with my rebuilt slant six

[1966wgn]

I have a 64 Dart with a 225 freshly rebuilt. A carb I had on it before had broken causing a vacuum leak and replaced it with a fresh one. For some reason however whenever I’m idling in gear the engine begins to act like it wants to stall (kind of a violent shimmy) and will smooth out then run rough again. She also feels like she’s starving for fuel occasionally off the line. Any ideas?

 

[Murray]

Vacuum leak?

 

[Bewy]

This could be so many things. Since the carb was replaced, I would look for an air leak at the mounting gasket; check float level; check that n/seat are not sticking...or leaking.

 

[mocarJoe]

Some of the carbs have a ball bearing under the power valve. Gets lost easily (Know I sayin).