i have an issue for my mitsubishi lancer evolution vi ,
my rpm is shaking after i pull out throttle when 2000-4000 rpm and hit the clutch. the shacking rpm is about 500-1000 and back to normal again, anybody know what the problem?

thanks

 

It sounds like what you mean is the RPM's "hunt" a little bit on return to idle. Check for vacuum leaks, and it could possibly be the iacv going bad.