What causes black smoke while accelerating?

I'm thinking it's the actuator, because I don't see a sweep etching on the side where it sits. I could be completely wrong though.

I told the dealership last week when I had an injector replaced. He told me low boost psi might be due to low exhaust flow, from the bad cylinder. But it's still low.

 

End of November last year. Thanksgiving.

 

Well I had an egr valve that was wide open. Plus a clamp was lose in the CAC circuit. Plus I had an exhaust leak on the the #2 cylinder. I have driven a whole 17 miles and it seemed to run fine. Boost hit 28 psi empty on back country roads.