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I am having black soot issue on boost or at around 2000 rpm and juddering on load. I have changed many serviceable parts now and I am starting to think it is my map that is the issue.. I have even played around with cam adjustments. I have no trace of who has done the remap previously on this...

I have recently replaced the timing-belt, tensioner and water pump. The marks are lining up (checked 4x times) and I'm about ready to put everything back together. But I have a concern that I'm hoping I can get some clarity on, first. I'm a bit worried the internals of the engine e.g. valves...