I did the LS swap in my CRX and got everything running right except that I don't think that my vacuum lines are right. At first, I thought it was my air idle control valve and I changed it and it still is idling rough. The motor will idle from about the 1.5 to 2 rpm range, then when it warms up it'll idle from 1.5 and bounce almost all the way down to the point where it seems like it's about to stall. The motor never stalls out. If i'm not correct, off of the egr valve it is tee'd off, I had the one line completely plugged. I then took the plug out and plugged it to the point where in is not 100% plugged(a little air is still being sucked in). It calmed the idle down, but it now is hesitant when I take off from a stop and when I gently let off the gas. If anyone has any answers to my problem, let me know.

Thanks

 

I don't know if any of this info would help. I had the motor rebuilt and bored 20 over(high compression pistons installed). Also, I have crower stage 2 cams, springs and retainers. I have a header, intake, and exhaust. Mostly everything I used in the swap is new.

Thanks