G'day fellas ...noticed the ol girl been running a bit rough lately at idle,,,, so i gave her the once over with new plugs,dizzy cap n rotor,leads.All the plugs look in excellent condition with no signs of fouling what so ever.... except #2....it's completely covered in carbon it's not wet or oily just sooty black.. Just wondering if this is an injector issue or something else ...also anyone know how to test this injector...cheers Some original photos have not been recovered yet.

Carbon Deposits, Too rich or weak ignition, so either #2 is getting more fuel eg leaky injector or dodgey spark, either cap, lead or plug