BKR7EIX are spark plugs not injectors.
I suspect you have carbon build up on the intake valves and possibly one or more lazy injectors. Noticeable on cold start up as that uses more fuel to warm up, but the fuel is not flowing enough to meet the expectations of the ECU.....causing a misfire...
Complete brushed steel trims in excellent condition and restored by myself
http://www.audi-sport.net/xf/threads/a4-b6-7-brushed-steel-trims-full-set.331405/
RNSE with adapter, 2015 and 2007 map discs, manual and code:
http://www.audi-sport.net/xf/threads/a4-rnse-b6-7-audi-navigation-with-accessories.331409/
Complete brushed steel trims in excellent condition and restored by myself
http://www.audi-sport.net/xf/threads/a4-b6-7-brushed-steel-trims-full-set.331405/
S-Line steering wheels.......one plain leather and one perforated:
http://www.audi-sport.net/xf/threads/a4-a3-s-line-steering-wheels-plain-and-perforated-two-available.331404/
RNSE with adapter, 2015 and 2007 map discs, manual and code:
http://www.audi-sport.net/xf/threads/a4-rnse-b6-7-audi-navigation-with-accessories.331409/
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