I have the INJEN UICP kit and I'm running it with my HKS filter..And I get idle issues,,The idle will go up and down from time to time,,,
Anyone havin any problems,,,

 

Have to ask...are you tuned to run that intake?

 

I've never had any issues with my Injen kit. Not sure if just the piping kit moves the location for the DV inlet (at least it does on mine to match to the intake), so I have to ask...are you recirculating it just like stock or venting to atmosphere?

 

I say vta, or vacuum leak. Your IAC may be going bad also.

 

Yes tuned with intake!!! and recirculating back into intake,,

 

could be a vacuum leak or iac as mentioned then.