the 2 additional injectors on my fmax kit look pretty nasty, do i jus yank em out, or can i jus spray some engine degreaser on there, and.....when i had a manifold leak, it put alot of black stuff on the motor, how do i rid that?

 

Just use carb spray, I dont know how engine degreaser will combust if it gets into the intake. or you could take the injectors out and clean them with carb spray. as for the stuff on the outside of the motor just use deagreaser or carb spray. I tend to use carb spray or brake cleaner for everything.