q45 throttle idle adjustment

[eh?]

I have a 1st gen Q45 TB on my rb25det. I am having problems bringing the idle to a decent level. Stock idle is 650rpm with ~20hg vac. It idles around ~1050 rpm vacuum reads ~16hg when warm. Sometimes it will go to ~850rpm and ~18hg vac. I just found out the TB has some secondary cold start soleniod built in? I do not have coolant lines hooked up to it. Can this be the cause of the problem? How is the solenoid moved? by coolant temp or pressure?Thanks

[Q45tech]

The "hot wax coolant temp controlled fast warm up idle cam" on TB is coolant controlled..........must have coolant circulating to return the offset to normal-----fully close TB.

Coolant is there also to help evaporate PVC/EGR vapors that would normally condense on the cold [relative to vapors] rear of throttle plate and vacuum port orfices at the bottom of TB.