I recently put a obd1 ls swap in my 95 civic ex. It ran fine when the motor was pulled but once i installed the swap it has a surging idle. I have no vaccum leaks, have bled the cooling system and when i plug the IACV hole in the tb it stops hunting, untill the car warms up then it continues to surge idle. I swapped out the IACV and still the same problem. Not sure where else to go besides replacing IM and TB gaskets. Any other suggestions? Thanks

 

I assume your using the OBD1 P75 ECU? Any CELs? Looks like you have checked the IACV. I would suggest cleaning the FITV. Its on the bottom of the Throttle Body. My idle used to surge when engine was cold and cleaning the FITV took care of it.

Heres a link to a How To:

http://www.ht-archive.com/showthread.php?t=1564019

 

FITV FTWW!! now my car doesnt sound like douces at a red light. Thanks bro

 

No problem. Glad it worked.