passat b5.5 tdi 130, low power,slighlty rough idle, rev hang

[seb.g]

Hi, still have this problem with my passat, changed all sensors over to no avail, compression test carried out- all fine. Im thinking there may be an issue with injectors/loom? How can either oft hese be tested, also where are the looms avaialble from apart from VW. thanks, Seb