idle liked to fluctuate between 1100 and 1500, idle screw was all the way in, but then i realized the power steering spring screw thing was all the way out, and screwing it in lowered the idle. I screwed that all the way in, and let the idle screw out a bit to get the idle around 7-800. I dont have the brake pedal idle fluctuation anymore, but sometimes the truck likes to idle as low as 600, and other times more like 900. any idea what could cause this? cold starts are real rough too

 

ttt..