Regarding my A8 3.0tdi I sometimes get an engine wobble upon starting up combined with shudder. Seems to happen more when engine is warm. I filled up at fuel station today, then got the wobble/shudder after starting. No warning lights on dash. Runs fine after the wobble is over.

I have noticed a fault code with my EGR - Insufficient flow. Could this be linked?

Could this be timing chain rattle due to tensioners? It doesn't sound like a rattle.

I have an economy remap on ECU at the moment.

Any comments would be much appreciated.