Sorry I did mean Vaux Com. The Injectors were from an excellent specialist Diesel supplier that I have used for years. As for did it cure it for 5 days the honest answer is that it is so intermittent that it is impossible to say. With regards the EGR, would it cause a idle misfire? and I would expect it to log a code as did my local Vauxhall dealer when I spoke to them. With reference th hydraulic lifter this had crossed my mind and I think an engine flush and oil change may be worth considering, but with it being so intermittent I am giving it more thought to see if I can prove anything!!