Hi. I have a snowblower with a tecumseh HMSK100 with what seems like a carb problem. Starts good, idles good, and even at high speed works good but once you start to work it or even just engage auger it wants to stumble or run poorly. You can adjust high speed and get it back and then it will do it again. It seemed like a dirty carb which I cleaned, and today I swapped it out for a good carb and same problem. I have tried spraying carb cleaner around carb and gaskets looking for air leaks but does not make a difference. Any ideas? Could valves cause this problem. Definately an older engine. Thanks
Blair