In the ongoing saga of my 83's very rough idle and rich running investigation , I thought I might have narrowed it to the AFS. I re-tested the AFS and I noticed that if I unplug the AFS it will purr like a kitten for about 5 secs then die. Twice I have tested the AFS per Clark's and even the internal temp sensor I suspected checks out per spec as do all the other tests. I even re-tracked it , and it looks brand new inside. It is getting 10.8 volts from the DME which according to Clark's is ok too.

So even though all the AFS tests are in spec, is it normal ops to run better with it unplugged ?

Thanks