I had a briggs 8 HP log splitter that was the same way. It never ran great from the day it was brand new 14 years ago, and went in for warranty work 2 times, never to be fixed properly. It would run great for a day or 2 at the most, then require adjusting the mix screw to make it run good again. The float valve never worked and leaked all fuel out when not running. One day it needed leaner, the next richer, and then back. I gave it the best tune up money could buy, a Honda 8HP. I learned my lesson with Hondas a few years ago: always buy them and forget about the junk. Now it always runs great. Besides those drastic measures, I would forget about the idle speed screw unless when it runs, it runs too slow or fast. The float adjustment is a poassible problem but I doubt it. I usually take the carb off, turn the mix screw in all the way counting the turns to all the way in so you know where to set it later. Then take that screw all the way out. On my older Kohlers, that screw is hollow and has holes so I clean them with carb cleaner and a single strand of copper wire to poke out the dirt. I spray carb cleaner through all orifices and remove float valve and clean it and its seat. Then put it back and see how it works, adjusting the mix screw at an idle to get it smooth. Your newer bigger engine is probably different than mine and I don't have the manual for it so I can't tell you the settings for the mix screw.

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