so lately since its been warm my car seems to idle funky! when driving everything is fine but if i come to a red light the idle jumps from 800 to 900 to stall! this doesent happen all the time but at least 2-3 times a day. i have no cel light either.the a/f on idle is 15.1 to 15.5 which to me is not normal cuz it usually at 14.9 to 15.1