06 Honda Odyssey Engine Problems.Help?!

My 06 Honda Odyssey is troubling me. The engine is overhrating, it keeps stalling/dying with an engine and oil light although I have oil and changed the engine because this situation had happened befoe. Furthermore, it keeps stalling/dying once I'm either at a stop light or stop sign an in would have to shut off the car and turn it back on. Also, there is white smoking coming out of the back of the car when I'm in motion. Along with that, the engine keeps shaking and knocking when I'm driving and it takes a lot of power to accelerate to a normal rate of speed. I already changed the engine which was VERY costly so what should I do?!

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