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The shift knob moving around is torque transferring through the drive line. "bucking" could be a list of things causing this.
Your first simple checks should be to make sure wires and connector clips are secure to your sensors. Pull each spark plug and check them. You may want to volt test your MAFs to make sure it's not toast.
Also depending on what you have, see if you can swap ECU's to narrow down what's going wrong.
Have you tried checking the ECU codes to see if there is anything obvious it may be trying to tell you?
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