One other subsystem of your carburetor could be contributing to your problems.
In all carburetors there is a system with various names, depending on the carburetor, which enrichens the mixture during acceleration. At curise, with a high vacuam, it will get fuel only from the main jet(s). As you accelerate and the vacuam drops, the enrichment device adds fuel to the mixture to richen it during acceleration. If this is not working properly, the engine can stumble. This would probably have show itself more in a slow opening of the throttle. The accelerator pump problem that I described in my previous message would show up more when "snapping" the throttle open.
'84 Euro 240D, 516K miles
'88 300E 5 Speed
Over 800,000 miles in