Recheck the idle pick up tubes. Under the venturi assembly, the small tubes that hang down in the well. Clean them with a tiny stiff wire, like a wire from a wire brush. Be sure the wells are clean.
There are also pressed in idle air bleed vents in the top of the venturi assembly, be sure they are both in there and clean. Some just had holes with no pressed in vents, just be sure both are the same.
Is this on a V8 or V6 engine? It likely has a dual plane intake. A vacuum leak on one side of the intake can make the carb difficult to adjust. Also be sure the engine is idled down to a slow idle when adjusting the idle mix. If you can see gas being drawn through the venturi, it is idling too fast to adjust.
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Today's Featured Article - Ford N-Series Transmission/Hydraulic Fluid - The Full Story - by Llamas. The transmission fluid in an “N”:-series tractor lubricates the transmission, differential, rear wheel bearings, PTO and hydraulic pump drive, and it also cats as the working fluid for the hydraulic lift. In 9N/2N models, it also lubricates the steering sector and shaft system. The owner’s manual for the 9N and 2N models specified the use of only two fluids. They were STRAIGHT MINERAL OIL SAE 90 (above freezing) and
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