Brief history: replaced old fuel and flushed through with fresh stuff, replaced all spark plugs, checked all injectors are firing with a stethoscope (well they make the same tick noises). Car is from 1987 HE V12 with Lucas ignition
Looking for some help pleasse, symptom is that the engine would start and run fine when cold, idling around 1000-1200 rpm and looks to be balanced and smooth. Then as it gets warm after about 10-15mins, it would start hunting, oscillating between 500 - 1200rpm. Any ideas on where to check next?