Allen,
If adjusting the idle mixture screws solved the problem isn't it clear that there was an idle mixture problem that is now corrected, or am I missing something?
Does Texas gas contain ethanol? California gas does and it causes a variety of problems when it evaporates in a carburetor that is on an engine that hasn't run for a while. For example one of my chain saws that hasn't been run for a while wouldn't start or run. Apparently I hadn't run it out of gas before I stored it. There is a tiny filter screen in the carburetor that had a clear film over it that totally plugged the mesh preventing gas flow. I saw that problem described on a arborist site and opened up the carburetor to check that screen. I've heard of similar carburetor problems related to ethanol gas from off road motorcycle guys who didn't drain their carburetors before parking the bikes for long storage.
