I need expert advice on a 7mgte, my idle has been high and ususally fluctuating depending on outside temp. I recently purchased a used idle air control valve, turned out to not work my idle was 2500. I took apart the original one cleaned all the contacts and put it back on and my idle is about 900 to a 1000 at times but still will go to about 1300 on a hot day. Ive checked all vac lines and replaced 80% of them. Is my problem within the idle air control valve?