I just finished my Ls swap in my CX hatch. It is running fine. I didn't wire up the O2 sensor yet, so the check engine light is on. But another thing, it is sputtering at low RPm. Like when you hit the gas it puts out a little till the rpms get up there. Someone please tell me whats going on? And one more thing. It seems like i can't get my idle to stay at around 900 RPMs it wants to IDle pretty low. Thanks a lot

 

Well it's not getting a reading from your 02 sensor. Those are symptoms of a bad 02 sensor. I would go ahead and wire it up, and then see how it runs after that. That's most likely the problem. If wiring the 02 sensor doesn't fix it, check all the vacumn hoses for leaks.