I have a lil problem I just got my car bak from the mechanic changed the cams shaft and cam gears so my problem is that when ever I turn on my car it idles loww and it turns of the way for me to keep it on is to hold the gas a lil bit for a while and then it will stay on it won't turn off and when I'm drivin sometimes it idle low sometimes normal...I changed the idle air valve before I took it to the shop now I don't know what it could be ! Any help thanks