Chuck,
I have replaced just about everything, including the AFM, and the off
idle stumble still persists.
And what really bugs the hell out of me is that sometimes it runs fine,
just as long as the temp needle is totally cold, or totally hot.
When it is on the way up, just moving past the bottom line on the temp
gauge is when I have to hammer the pedal to the floor, just to get it to
move.
The only thing I haven't messed with is the throttle positioning switch,
although, I did put my multimeter to it and it doesn't show one iota of
continuity, open closed or in between.
This may be my problem, and I will replace that also, just to add to the
process of elimination factor.
Electronic fuel injection-----Phooey!!!
However, I will also try the disconnect the oxy sensor, trick tomorrow
morning, just to see what happens.
This vehicle gets worse MPG than my full sized 86 Blazer, with a cranked
up LT-1 350!!

Later,

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Terry 85 GL