LOS, or LIMITED OPERATION STRATEGY will NOT be like this it will just be flat, it does NOT cut cylinders out.
I doubt very much it is running on two cylinders, if a sensor was buggered it would affect all the cylinders.
The coil or it's wiring is the most likely cause as the baddy.
I would think it will definitely have a LOS mode as it has CAT.
Does it have a exhaust gas pressure differential sensor ?, as this will make it go absolutely flat.
tabetha