Bike wont tick over when cold fz1 2007

[davey boy]

Any help would be apreciated off touring the outer hebridees in a few weeeks so want to get it sorted
I have fitted a fce and a power commander v and since then when i start the bike i have to hold the throttle open untill it warms up then it runs perfectly
Could it be the o2 optimiser
Any sugestions