Idle question - SOHC KA

Anybody on here ever remove the secondary butterfly valves off a SOHC KA24E ? Perhaps on a DOHC ?

I did and I plugged up the holes, however I noticed a higher idle in the area of 1100 - 1500 rpm at times. Im almost positive its due to the lack of the secondaries but I am curious if anyone else had any similar occurrences.

Im thinkin I should adjust my IACV and the issue should go away. Any input?

Thanks