This sound like a bad PC board. At the head of the tiller up where you make your speed adjustments, inside is a PC board that controls all of the functions you are describing. These most often fail due to exposure to moisture as it is an electronics board. Fortunately, they are relatively cheap, about $35.00 or so. You must remove the shroud covering the tiller, remove the speed control know and expose the board inside at the top. there should be four screws holding it in place. Remove those, unplug the wires leading to the board, and install new board, plug it in, reinstall shroud and it should be off and running.
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