Seems you can adjust the idling speed using vcds
https://www.audi-sport.net/xf/threads/186452/
I know this make not explain why the revs are higher but maybe your mechanic adjusted it?
Have you checked the DV as suggested above? These are known to split.
Also, check the intercooler connections (you will see oil near the connections if they are leaking).
Your symptoms sounds like a major boost leak.
See if you can borrow VCDS as some of the generic readers don't always display all the error codes in all the modules. If you give us a general idea where you are someone may be able to help scan the car with vcds.
The one on the fuel rail - you can fit the RS4 one before the map goes on as it won't make any difference with the std map, however the std items are known to fail, so I'd fit it, especially if you already have it.
Injectors is a good shout, may not be able to supply the extra fuel for a cold start hence the misfire / poor running. Did you check the usual suspects i.e. PCV and dipstick as these can cause issues too?
I would check the pipe between the abs pump and the wheelwell first - maybe run a new temp line straight from the pump to the caliper to see if there is an obstruction.
With regards to the servo, there is a seal at the back of the master cylinder that can leak fluid into the servo regardless of...
Did you check or replace the actual brake servo or just the brake cylinder as I watched a video the other day of an internal leak within the servo itself with no other obvious issues with the braking system?
I know this would usually affect your entire braking system, but you seem to have...
Splutter not normal, even if left for weeks on end. Maybe have your injectors checked out as they are known to leak with age, and this could lead to more serious trouble. Have you checked obvious stuff like dv, leaking IC pipes, plugs?
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