I had an H with similar issues; thought the valves were needing attention. However, when removing the manifold to take off the cylinder head, one intake runner fell to the floor. It had completely broken off and until the engine was warm the issue did not show up. Use a propane torch (not burning) and flow the gas around the manifold area when the engine is acting up as you described. JB-80 or other similar combustible gaseous product will work also.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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