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Compression test is fine, roughly 9.5 bar on all and more importantly even across them. I reset base timing and that seems fine. Spark is there too, can see it arching when I pull the leads out, doesn’t mean its happening at the right time though I guess. Dubious it being fuel as 1-2 and 3-4 which are on a shared runners and one side of the dcoe so you would expect them pairs to have the issue?
Spoke with a mate/tuner last night and I’m going to try flipping the timing manually in the ecu by 180degrees, then move the ht leads and see if the problem moves to cylinders 2-3. If it does it may be a failing ignition driver on one side (paired 1-4 2-3). If it doesn’t it then leans back to being some weird fuel/carb issue