The engine doesn't whant to idel..keeps on cuting

Hello, it could be a variety of things that is causing your trouble. You could have low fuel pressure, you could have an exhaust restriction, you could have an un-metered air leak or an engine vacuum leak. Or several other possible causes! You definitely need a trained set of eyes and diagnostic equipment to check your vehicle out. Following are suggestions via a link for local shops that can help! Good luck! http://repairpal.com/lexus-within-10-miles-of-south-san-francisco-california-94080