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I am having issues with my Toro walk behind model 20065. I have cleaned the airfilter, replaced the spark plug drained the old gas and replaced with new gas and changed the oil. Even after all that I am still having issues with keeping the mower running.
Often a mower that has sat for a while can actually build up crude in the carb . This is caused by ethenol in the fuel, sound to me like you need to take your carb apart and clean it. heres a really good youtube video to guide you through the process .https://www.youtube.com/watch?v=s2NcBVRM… Hope this helps