2010 Mazda 3 stalling at red lights
 

I have a 2010 Mazda 3 with 45K miles. It recently stalled twice in one week at red lights, but then cranked back up. Mazda dealer said throttle body dirty and needed cleaning and new gaskets. Days later, car stalled again at red light, but, again, cranked again. Mazda said fuel pump needed replacing due to fuel pressure fluctuations. Then, this week, car stalls out at red light, but cranks up. Took it back to Mazda. They have no idea what is wrong. Any ideas?

faulty motor mounts can cause stalling issues

AT or manual, ac on ac off????

I have the same problem with 2005 mazda 3. I've heard it could be a faulty thermostat or MAF(mass airflow sensor).

Before I overthought it, and definitely before I started thinking about changing the MAF or motor mounts, I'd check/replace the 02 sensor. :)

We were experiencing stalling when coming to a stop when the engine was cold. A mechanic friend with a very busy shop has told me the air idle motor is bad. Previously I had checked with Mazda to see if there were any bulletins out on the issue since it seems to be a very common problem with Mazda 3 owners. They had told me there weren't any bulletins on the issue.
Mazda 3 owners check the air idle motor if you experience the same. It could very well be your problem.