Help needed to allocate problem on VRS 2.0 tsi

Hi everyone.Well not sure with what to start.I have slight engine judder on idle hot or cold engine doesnt matter eaven on cold start its same.Didnt had any codes for a while until 2 days ago driving to work and car lost power started to shake and check engine light came on.Pulled over switched ignition off turned back on all good no engine light and car runs fine apart from juddering on idle.Went to work pluged in scanner and faults poped up as low fuel rail pressure and missfire in cilinder 3.So far have changed spark plugs as was done while ago then new coils(all) suspected camshaft sensor so changed that too and tomorrow will be replacing crankshaft sensor. By the way there is no increased fuel consumption and moastly car performs as it should however sometimes I notice that it doesnt pulls as good as should do and then next moment its fine again.I ve been in 3 garages so far and no any solutions whatsoever