90 accord running rich/ etc fuel problem?

I think im running on 3 cylinders. I have no power lots og
hesitation.

I do have spark. I replaced spark plugs and no diff. 4 days of driving
i looked at plugs and #2 spark plug was all carbon. when the RPMS are
high i do have smoke.

Could this be an injector problem since i am getting spark? when im at
a stop and accelerate it takes forever to go.

When im driving on the hwy or whatever its fine. except when i try to
give it gas to speed up.

LMK!

hey i have a 96 civic and my car is doin the same thing i think cuz i put
on a kn n filter and now my mpg went from 33mpg to about 15 - 20/mpg what
did you ever find out ??? if anything

tha nks