A8 Question

[FBFISH at aol.com]

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Group- I do not see many posts on A8s, but I thought I would give this a shot
in case someone has had a similiar problem on a late model Audi. The car has
56K miles on it and recently started running rough at start-up only if left
sitting for an extended lenght of time (week or more). The problem seems to
be worse if it is rainy/damp. The car smothes out fairly quickly and will run
fine untill left again to set for several days. This has occured on at least
4 occasions. I have pulled the codes after each event which are always
associated with one bank (cyl 5,6 or 7). VAG COM says I am having intermitent
and/or random  miss-firing. I have pulled the plugs and cleaned each with an
abrasive blasting, inspected all the wiring and spark plug boots with no
problems I can visualy detect. With no distribuitor, The only common item
would be fuel, but that does not seem to be related to one bank. Any BTDT, or
suggestions on what I am overlooking. BTW, is there an A8 site? TIA
Frank Santoro
1990 V8
1998 A8