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This has happened twice with mine, once meant a complete engine rebuild, however that was not a slight movement and it coinsided with the idle reducing to about 700rpm. The other time was the front crank pulley had spun on the key on the front of the crank which caused it to wobble, if you look down at the front crank pulley with the engine ticking over you should see it turning without any sideways movement.
Other than those times it has run as smooth as....