I found it!!!!
After two years I finally found what the hell this was.
The car came back from service running like crap, refusing to idle and being a pig. Normally it comes back running sweetly then after a while the above described problem would return.
it transpires from my investigations this afternoon that there is a split where the hose clamp grips the air intake pipe next to the throttle body. When the vehicle was serviced previously the wiggling involved shifted the pipe so it sealed again until coming loose a few weeks later. Until I find the part umber on Monday and beat the grease monkey properly for not spotting it and returning my car running like crap, I have bodged it with gaffer tape and other evil things. At least I now have a properly responding s8.
I have been waiting for this thing to die for three years and it still keeps going.
Bill
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"Man Math" - The means by which a caring husband convinces his wife that a 4.2 A8 is in fact cheaper to run than a tiny Auto crap box
"Being in touch with your feminine side" - The ability to, in the 30 seconds following a major accident, obtain your wifes approval for replacing your big german car with another "because otherwise we'd be dead".
See also sulking for two years until she finally allows you to get another purely on the basis of your current one being the wrong colour.
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