I can't explain it, but some linkages are set up differently than others. I hope you have the slider.

I would just advance the fuel, and do nothing else. By doing this, you'll increase pickup, and highway power will be immensely improved.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)