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about the hot air i would say its the heater flow valve. i dont know much these cost or how to fix them.
the loud humming is the front hub bearing/s they cost about $40 to purchase and installation costs depends on how much you do yourself.
the skipping and other such things could be the electrical, but on mine it was the fuel filter it has ran fine since. i would try the fuel system first, then go to the electrical.
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