As has been said, it should hover at 14.7 at idle. 16 is out of bounds. What were the learned and immediate A/F corrections running at.
Hunting only at idle can only be a few things.
Leak somewhere between the MAF and the O2 sensor.
Bad intake map.
Bad MAF or O2 sensor.
If the BOV is bad, pulling it and blocking all the holes should fix the issue at idle.
I have an after market BOV & plug you can try.
__________________
I am a Commodore PET --- Now get off my lawn you kids...
|