I scanned a A8 today and got several codes..
it had random misfire on all but Cyl 1
16684,16688,16690,16687,16691,16686,16689,16692
it also had 17536,17538 fuel trim bank 1 and 2 system too lean.
and 17545,17547 bank 1 and 2 system too rich
17549 load calculation cross check implausible value..

listening to it idle it sounds fine but the injectors sound loud for some reason..
he said he swapped the coils around and changed spark plugs, vacuum lines, air filter and fuel filter.

the cars seems to sputter when driving and has little or no power when started in the morning.

where would you guys suggest to start looking for the problem..
I'm thinking injectors but I could be wrong, and assistance would be great

These are common failure points that can cause some of the codes you are seeing.

Is this a '97-99 or 2000-2003 A8?

of wack! Had to replace it!