... so we do agree on something, anyhow. I'd start with the cap/rotor/wires/plugs, as I suggested 22 posts above.
After wondering what the heck caused the stir, I reread everything I put up on this thread. I think the issue may have been my own selective quoting of my 8 paragraph opus from yesterday, particularly the sentence which read, "Hotter plugs might help, but I'd be willing to bet money that the problem isn't ignition at all." The bigger problem is probably that I'm offering more information than was being requested, which is why this will be my last post here.
Clearly, I think (as I generally do) that the stumbling problem is ignition. I say again, "95% of all carburetion problems are ignition".
In the quoted sentence, was talking about the sooty plugs... which I don't think are likely germane to the stumbling problem. I never told him to trash his carbs, just tried to point him where I'd look if the problem did turn out to be fuel.
In the future, I think I'll just sit on my hands for threads like these. There's almost never a positive outcome in participation.