SR20 running on 3 cylinders?

[JDMxJosh]

it's a SR20DET Red Top.

my #2 cylinder isn't sparking, it sparks for only a few seconds.
I've already swapped the coilpack & sparkplug.
& my ECU isn't throwing any codes.

please help.
Thanks for your time.

[AdrenalineS14]

you check your coilpack harness voltage and ground? should check it out maybe bad.

[EsChassisLove]

check connections as well. Mine was corroded on #4.

[gunmetalr32]

all fixed!!

[JDMxJosh]

update: Fixed, thanks to gunmetalr32.

Bad injector.