IMO, you can't have clean hot and cold idle without a choke. Cold engines like to be rich (choke on) until they warm up (choke off). I have the hot idle on my 950HP nice and clean and just deal with it being cantankerous when cold.
Idle gets better when warmed up but it is still too rich at idle when warmed up. Shoot I gotta go look at the air bleeds, be right back.
