OK, I'll state it again. The mechanical rod from the linkage to the pump has ABSOLUTELY NOTHING to do with the running down the road. ALL mixture is determined by the vacuum governor as in the picture.

The link running from the throttle linkage to the back of the pump is a dampener arrangement to stabilize the idle. IT DOES NOT need to be in place to run properly. If adjusted wrong it can only impare runnning.

These pumps had no ALDA altitude compensation as the vacuum governor should accomplish the same thing. You sound like you might be too rich overall which can be changed with shimming. Also be sure that the on/off lever is totally free of loading when in the "run" position. The cable end has an oval slot for the fuel lever. This is to allow enough movement in shut-off but no tention in run.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician