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Message: <blockquote data-quote="Richard L" data-source="post: 791639" data-attributes="member: 52972">Ava,Why did you not take it back to the mecahnic that made the first diagnosis of bad O2 sensors??  I suspect that he talked you into a tune-up, which guarntees to fix nothing.  He should reimburse you for the cost of the things he replaced that did not resolve the problem.If I have a problem with stalling (or any problem) and I take it to a mechanic.  I don't authorized them to do anything but fix the problem.  If he says I need this part or that, I tell him fine just as long as it fixes the problem.  If it does not fix the problem, I will not pay for him to charge me for parts when he does not know if that will resolve the problem.A well equiped shop will have the necessary tools and test instruments to verify exactly which part is failing.  If he does not have the equipment, then he is only guessing at your expense.Now for your problem...The O2 sensors may have been bad?? but that is not the cause of your stalling.  I would be willing to guess that you have a dirty or malfunctioning IAC (Idle Air Control) valve.  I suspect with over 70K miles, you need to clean the throttlebody and the intake system.  There are products designed specifically to do that.  Sea Foam is one that many have used here that works well....Rich</blockquote>