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You have a fuel advance problem. It is possibly a transmission to engine link problem. When the transmission begins to slow down, it sends a signal, of some kind, to the engine indicating a need for more fuel. Obviously this is not happening. Your engine commpression might be low due to engine wear. Have the engine checked at a shop that can make such a diagnosis. Vacuum leaks can also rob an engine of power. One other thing, if your bus uses any kind of exhaust gas recirculation, check the system to be sure it is working properly.
Thanx man, I would love for you to e-mail me to see if you can help me out a little more. Skoolies rule and we have to help each other make them better. Peace man...