AIR FLOW METER (AFM) Fix

 The idle and acceleration seemed inconsistent, with a notable flat spot moving out of idle to 2000 rpm 

I suspected this was the  AFM and used this guide to fix it

 http://www.clarks-garage.com/shop-manual/elect-22.htm

I did not take any pictures of mine in bits as I was desperate to get it back in the car and test it. 

I used the bend method described below, to move the arm on to new contact path and out of the grove it had created after 30 years of moving in the same arc. It worked and removed the flat spot. 

Instructions are 

Place a piece of paper between the wiper arm and the potentiometer conducting strip. Change the position of the wiper arm by pushing down on both sides of the back part of the wiper arm (see arrows in picture below) to the arm slightly. This effectively  changes the length of the arm such that the contacts on the bottom side of the arm will ride on a different (ungrooved) part of the conducting strip.