New motor as of 2 months ago.

During wash cycle, it makes a lound pulsating or surging noise, as if it is trying to spray. I rigged it so I could see inside the diswasher during a wash cycle. I notice that during one of the surges, the spray arms stops then goes around once the stops during the surge, then around onece then stops briefly again, and so on. The arms go quite slow..Don't know if that's normal or not.

Would apprciate any help on this. Thanks.