Engine: T5: V70 idling and surging problems.

[Bruceleemad]

So, can anyone help ? 2001 Volvo V70 T5. Fault codes as in image, but main one is 644a. This can up last year and I bought a new camshaft reset valve and fitted it. It does not seem to have fixed my rough idle or the surging at low revs. Also had pcv system replaced, new oil trap etc, and that doesn't seem to have helped. Can't find any obvious vacuum leaks, but getting smoke test next week. A few fault codes are about the etm and I wonder if a faulty etm can throw up other codes ? The etm is a marelli yellow label. Anyone got any clues as to what I can do, without taking it to the local stealership ? Thank you.