When I stop at traffic my car would idle at 700rpm for like 15 sec then drops down to 400 rpm like its going to stall. I have Kinetix V4 plenum and pop charger, does that mean I got a leak somewhere?

 

Hey man,

I had the same problem and was fixed easily by the dealership a few days ago. I'm not sure about the mods, but I think they just have to reset your ECU think you can do it yourself by disconnecting the battery for 12 hours.

 

Try resetting the ECU yourself