Try the cheap things first ...
Have you checked the engine coolant temperature and the air intake (if you've got one) temperature sensors.
My air temp sensor was dead, cost €12 to replace and changed the duty cycle from 50% to 90+%. Re-adjusted and everything was great aside from minor hesitate immediately after hot start. New Beru plugs (€20) solved that.
And all this is on the original, 19 year old distributor cap - that's the next purchase.
Good luck.
RayH
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