if it idles etc ok unplugged, leave it unplugged.

i had no ISCV on my cossie was it was replaced with an anti-lag valve.

only on the VERY coldest of mornings (i mean minus somthing) it would stall 1st time if wasnt careful, but 2nd time itd start and idle easy.

99% of the time itd start on the button and idle fine with no valve.