started the car and everything's fine. 20 minutes of driving later and i notice that every time i disengage the clutch my rpm doesn't drop down. it either stays where it's at or drop down to 2500 and stays there. so i park the car and gave it a couple of revs, rpm drops down to 800 then goes up to 1500 then drops down to 1000 and stays there. so i drove around for a little more and it alternates from rpm staying at where it's at or droping down to 1000 and staying there anyone had this problem or have any idea what's causing it? mods on my car are aem intake, aftermarket im, b16 tranny, itr flywheel and act clutch.

 

Your IACV could be sticking. Have you set the timing and base idle for the car?

 

just bought my car a month ago. everything works great untill 2 hours ago. forgot to mention that it's p28 chipped. i haven't mess with anything yet. i'll take a look at it tomorrow or this weekend. thanks