Actually, the airflow sensor is the device that makes the major adjustments to fuel flow in that as the plate is deflected it displaces the control plunger in the center of the fuel distributor, increasing or decreasing the orifice opening to the injectors. If it is out of position, it places the plunger in the wrong position, thereby providing an incorrect amount of fuel to the injectors. This is especially a problem during start procedures since some major aspects of fuel control, i.e. lambda, are not part of the start cycle, only the cold start items have much input.
Dirt, air leaks, oil, and corrosion are common problems with this beast, as are improperly adjusted stop pins and uncentered sensor plates. As with any system sensitive to small adjustments, patience and diligence are essential.