SR20Det Running too rich or maybe a bigger problem...?

[spoh]

Ok so when i had my swap done the company failed to realize my o2 sensor was bad and they didnt replace it, i found out the hard way when a guy who does inspections for me told me it was no good.

So i got it replaced asap..Now im noticing that my car is choking up in 2nd/3rd gear and backfiring, Not huge sounds or anything but pops that i can notice and my acceleration is pretty bad cause of it. So i dont know what to do...

I'm not sure if its my intercool piping letting out air causing it to run rich...if it was how would i know that it is letting out air and how could i fix it?

So far its obvious that the car is running too rich or it wouldnt be choking and backfiring like that but i dont know how to fix the problem of it running rich...my IC piping seems fine but i dont know how to get the car back to normal again.

[s13sr20chris]

okfirst unplug the o2 sensor and see if anything changesthen check the 240sx/KA-T section for the air leak writeupyou can check all your pipes for leaks with that.