Its got fuel direct from tank via electric pump to injection pump, (no lift pump, no fuel filter) I swapped the injectors, still no different, removed stop solenoid and took out the plunger, still no different, played with pump adjustments, still no different.
Its blowing out smoke that smells like unburnt fuel, almost like its putting too much fuel in, but interestingly if I pour some diesel direct into the intake manifold, the revs start to climb and I can catch it on the throttle and she seems to clear and rev and I can hold it at 3/4 throttle no problem and rev up to full throttle, but as soon as you let the throttle back past halfway she starts spluttering and smoking again.
The only real thing different to the first start when she revved up fine is the intake manifold and exhaust weren't fitted then, the exhaust makes no difference, so I'm gonna try taking the inlet manifold off next.
Anyway here is a video of it starting on the button and revving first part throttle ok, then spluttering and smoking, then I add some fuel to the manifold and catch the revs and she holds the revs fine and the smoke clears.
https://youtube.com/shorts/qUdGt6XbHzc