New exhaust and revs

[fritzy21]

I've just put on full exhaust system (extractors back) about a month ago on my vu s ute and i noticed that when changing gears when u have the clutch in, the engine will either maintain its revs for a couple seconds at about 2500 or increase then drop. Could anyone share some light about this.
Cheers

[vt s]

happens to pretty much every commodore thats manual.
I have same prblem with my vt.
Your IAC has shit itself.
Not sure how much they are frm holden but i would prob recomend just grab a whole second throttle body.

[fritzy21]

thanks mate