This is nothing against you. Just because you said you did something does not mean you necessarily did it correctly. People make mistakes. Especially when you are getting frustrated and do something "a million times" for example.
Unfortunately a new carb did not help when I had a similar problem. My snowblower with the H80 Tecumseh ran like yours from new out of the box. I always had to run with half choke or it would not idle, and as it warmed up it would begin surging when not under load. I never let fuel sit in it over the summer. I cleaned the carb "a million times." I poured quarts of mechanic in a bottle, seafoam, and berrymans b12 chemtool through it. Nothing changed. I lived with it.
Eventually I tried a cheap China carb off ebay. Still ran the same.
The only thing I found was that these engines have too small of a hole in the idle jet. People found success in drilling out the idle jet to the next size larger. I did not. I went and got a set of carb jet drills. Put one in my Dremel. Touched it to the tip of the idle jet and SNAP! Drill bit jammed in the end of the jet and broke off. Junk. Had to wait a week for a new jet to arrive in the mail praying that it would not snow. Did not try again.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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