With respect..what makes you think they need replacing?....I have mine in my 300tdi since at least 250k and they're still going strong with no hunting or missing...what I do though is put a litre of petrol in my diesel tank every once in a while to keep them clean...by coincidence I have just had the head off and the injectors were still in good condition...so I kept them in...
Just sayin' like...
Maybe you could try and good clean first before parting with any creds?
Try a couple of litres of petrol in a full tank and see if that pays dividends??
Good luck

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