300ZX V6-2960cc SOHC Turbo (VG30ET) (1984)
3. On automatic transmission equipped models, when checking idle rpm, ignition timing and mixture ratio, checks should be carried out while shift
lever is in "D" position.
4. Make sure that diagnosis mode selector on E.C.C.S. control unit is turned fully counterclockwise.
WARNING:
^
When selector lever is shifted to "D" position, apply parking brake and block both front and rear wheels with chocks.
^
Depress brake pedal while racing the engine to prevent forward surge of vehicle.
^
After the adjustment has been made, shift the lever to the "N" or "P" position and remove wheel chocks.