86 nisson

Ok I finnly got it to run but is smokes more than a 80 year old, is it still the injecters or could it be pressure reg, ive replaced maf with differant one, and hook up vac lines by the sticker under hood, I dont hear anymore clicking anywhere . It still stumbles but runs half way decent but is smoking badly. I checked the codes best as I can tell code 12 and 13 came up, but I also think 24 and 25 showed up but I dont see the code go that high, so I doubt that part, thanks for the help again