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Al late model automatic 928's need it checked, and its more than checking the flex plate. Checking the flex plate and releaving any tension on the pinch clamp shows whether or not pressure is on the crank now. Checking crank end play is to see if the thrust bearing was damaged in the past.
No guess on the surging, could be a variety of things. What I think works best is to take a restoration approach to the 928, and go in and refresh everything in each area that gets opened up. Pulling the intake and doing all related hoses etc. is a good place to start, especially all fuel related lines.
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