This is a good one diesel passat with a misfire just like a spark plug/lead fault. Fault will also occur static at 3750 - 4000 rpm. No fault codes stored, had a new maf due to major difference in desired & actual output in live data. Even with new sensor still major difference in values i.e. desired 850 actual 475 static, figures on the road better sometimes achieves 800. Have checked all pipes, boost pressure, removed cat from turbo flange so not cat or exhaust blockage. There is a wiring harness entering cylinder head at rear left of engine to injectors. Can these injectors be tested with low amps probe ? If so anyone got any wiring diagrams, pin data ? Any thoughts very much appreciated.