Re: AFM and control plunger

First, remove the air cleaner, and move the air flow sensor plate by hand through its full range of movement, feeling carefully for any notchiness or binding. Do the bearings allow any lateral movement? Is the sensor plate centered in the bore at rest position? If there is any question about the smooth movement of the sensor, some disassembly will be in order.
Removal of the fuel distributor will allow you to check the plunger for free movement independently of the air meter. DO NOT DROP THE PLUNGER. As you lift the fuel distributor (FD) reach under it and hold the plunger in its bore. With the FD removed, you can also check the movement of the sensor plate by itself.

Also, with the FD on the bench, the pressure regulator may be opened for inspection (and the o-rings replaced).