RE: Flameout problem
Actually, my experience is the exact opposite of what Eric says, I'm not sure why.
If you get an air bubble, it usually puts the fire out, but the ECU takes a couple of seconds to sense it via the thermocouple and so more fuel goes into the engine on the back side of the bubble - making a smoke trail...
If the ECU commands a shutdown, the fuel solenoid goes shut right away - no smoke trail...
Bob