I just replaced the pcv valve and it didnt help.. but i do know the old one i took out wasnt helping any.. was cracked..

but it still did the funny idle..
so then i unplugged the eacv(the thing behind the intake manifold, cylinder shaped???????) and low and behold the idle stopped bouncing and then i relized the idle was set to 1200rpm.. hmmm.. lowered the idle aand then sat and waited.. never did the idle bouncing problem start agian. .but as soon as i plugged that thing back in (took awhile) but it did start bouncing agian.. until i unplugged it agian.. What exactly is that thing the EACV? and is it bad and if i have to replace it how much am i looking at.. no more than 150 hopefully..