Are you sure it shows "Speed low" before it flames out and not straight after? If the engine stops due to fuel or what ever then it will show this simply because fuel flow was intrupted> the rpm dropped below minRPM> the ECU shuts the engine down but of cause it was already flamed out at that point. It then displays Speed low.

If you are right about when it displays the Speed low, then It is most likely to be your RPM sensor at fault.

Jason