Oh yeah, I forgot to mention. If you are stopped at a light and it starts idling low, try putting it in neutral. If it goes back to idling normal, it might be a leak in your vacuum system. Also, if you notice your brakes are a little stiff, that's a good indication it's a big leak.

 

I know the fix.I figured it out just a couple days ago. Scrape the paint off the ground point where the battery grond wire is attached to the car. Mazda didnt think about the current you need to make teh car run smooth. After I did thsi it fixed it