You could have the following:
1]... Sticky airslide
2]... bad temperature sensors or wiring
3]... Cold start injector is not shutting off, unplug when engine running but cold.
4]...Throttle position switch
Assuming warm engine idle is ok and CO emissions is within range check all your wiring, sensors etc first, plus check for any air leaks / spli hoses etc especially in the air slide side of things
HTH
Malc