I'm having a problem where when I'm driving my RX8 it will sometimes stall. Right before it stalls it studders like it's not getting any fuel, and this usually happens in the lower RPM's. I can prevent it from stalling by pressing down on the gas more, it will jerk a bit before going smooth. When it does stall the check engine and battery light will come on, however they turn off when I start up the car again. It has no trouble starting and doesn't stall when it is idling. The stalling seems to come in spurts, like I will be driving fine for 30 minutes, then it will stall a few times, then be fine again.

If anyone has any ideas what could be causing this or what to check, I would really appreciate any input. I'm thinking I put some bad non-premium gas in, but I'm not sure if that would cause this or not.