Sounds like the others pretty well covered it. I will add that last year, I found 3 farmall H and Ms with loose manifolds that all had sputters when idling. Just had to retorque the manifolds readjust the carbs and it fixed all of them. The downhill thing does sound like a low float setting. I do have an F-12 that can start hard if parked down hill, but most of that problem is a slightly leaky needle valve on the float I haven't bothered fixing yet. It runs with a cloud of black smoke with a full gas tank but runs perfect with a half tank. The F-12 tank will gravity feed if full but needs the pump at half or lower. One more thing, if you rebuilt the engine did you go back and retorque the head and manifold after it ran a while? If not do both and readust the valves and carb afterwards.
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