Hi all. I've researched the forums and found some stuff but the problem persists. When I stop at the lights , my rpms go down to 500 and the car shuts down. Doesn't happen always. I starts right back normally. I've tightened fast idle and cleaned the iacv. Same thing happened this morning. Do you have an idea what it could be? Thank you for your help I really appreciate you guys

 

Its possible you have a lazy oxygen sensor. If it hasnt been changed in over 75k or so it would be wise to swap it out with only a Denso unit.

 

There are 2 types right? Upstream and downstream. Should I replace both?