Mine did not have the small plastic black wire right on top of the center
arm.  Maybe all '86+ had them from new.  My '85 did not.  I hooked the O2
sensor lead up to my voltmeter and ran the engine up to about 3000 rpm.
The AFM was moved clockwise to lean.  Pry away the spring clip and move the
wheel.  Mark the original position with some paint  in case the wheel moves
too fast and you lose track.  I got the readings down to  ~ 0.75 VDC.  It
was running more like 0.85 before.  One or two notches more and it would
not run right.  I am going to leave it here until I check the mileage.

                                                   Jay