When I swapped out the AFM from my 87 parts van over to the 89 it helps the way it runs quite a bit. 

Seems to help the hesitation and bucking significantly. 

It still does buck a small amount but in the lower gears but its much improved.

I checked the flap inside the opening on both AFM units and they move freely.

This rig already has the wiring patch upgrade connected inline.

I am wondering if I can rebuild my own AFM and renew the sweep location or anything else that needs to be done to bring it back to perfect running order.

Thanks,

Doug