If you pop the linkage rod off of the throttle butterfly (ball and socket) and loosen the locknuts on the linkage rod you can thread it either direction to get the relationship you want. If there is not enough adjustment here, then you can go to similar adjustments at any of the other linkage rods downstream of here.
Good Luck.
Nick.
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Nick Shumaker
1982 911SC Coupe
nickshu@yahoo.com