Don't look good, have you had a look when its running. Best to try and clean it all out first and see if it comes back. It may well be leaking from the union that goes to the injector and then burns off leaving the black stuff
That is what happens when they leak and the combustion gasses build up over time.
When they are like that they are a nightmare to get out to clean up and replace the copper washers to seal it again.
Just a dodgy injector seal which is pennies. As said removing them is the problem.
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