Coilpack Or Injector ?

[hisoka]

hey SAU'ers, nissan noob here.

i have just engine swapped a rb20 into my silvia. and i have a slight problem

the cyclinder 5 is not working. now my question to you guys is what is a good way to check wether my coild pack needs replacing or the injector.

i have yet to swap around coilpacks, i have just got new spark plugs but the old ones seem to be good (blitz brand and good colour) except for cyclinder 5 which is black.

from this observation am i alright to assume that there is fuel getting in but no spark occuring.

the car is pulled apart at the moment and i thought id post on here before jumping into it.

there is another thread just like this one and i got some good info from it, but just wondering if my assumption on the spark not firing is correct judging that the plug itself has tuirned black

thanks for any replies