evening all, i have a 2002 a6 4b 2.5 AKE with 240,000 kms, in the last 4 months Edward (old iron) started running rough and had a real rough idle. started with injector cleaner / diesel additive, which helped - for a week, then it returned. another few treatments had the same outcome. then tried the 1:200 two stroke oil in the diesel. helped or a few days then, the rough running returned. i m guessing this is a injector malfunction, rather than a nozzle issue. my next plan is to get the injectors cleaned and checked at Bosch. should i start to get worried about the vp44 or cams? any thoughts? havent had The car checked for error codes as yet.