"Now, the car has developed a stutter/hesitation when putting your foot down at 1600rpm up until about 2k."
^^
Petey, did you try getting some sensor cleaner on your MAF sensor? If you get over to another meet and there is another D2 there, maybe swap MAF to see if that helps the issue? (I have had that exact issue on many previous diesel cars)
What mileage you at? seems a bit weird if you injectors a knackered already?
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