help !!!!

Hey my name is nick and I am sure that you have read in the other forums that my car is bogging and I don't know why well I think I have it down but I dunno what to do I have carbon all over my spark plugs and they are like 2 weeks old so my mechanic says the car is running to rich so he said that I need to adjust my air fuel ratio I was wondering if anyone knew how to and it that could be it and someone else said that I need to adjust my fuel pressure regulator but I don't see how you can get to much fuel in a forced air induction car and if I just threw in my boost controller would it lean it out also could it be my injectors cause they are from my old motor. if anyone could let me know I would appreciate it.

Thanks, Nick