the knob should unscrew counter clock wise
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See Figure 1
Fig. Fig. 1: Shift linkage adjustment-1984-88 vehicles
See Figure 2
To adjust the Throttle Valve (TV) cable, refer to the accompanying figure.
Fig. Fig. 2: TV cable adjustment procedure-1984-88 vehicles
Park Lock Cable
See Figure 3
To adjust the Park Lock cable, refer to the accompanying figure.
Fig. Fig. 3: Park lock cable adjustment-1984-88