When a warmed up engine that has a recently adjusted high-speed needle dies on application of throttle, one of two things is happening. OK, maybe your glow plug is also crapping out on you, but after checking that...... You've probably got a low-speed needle that needs adjusting.

If the OS46ax is fairly new, there is a good possibility that the low-speed needle needs a small adjustment.

Best way to do that is with the pinch test. It's described in detail in a number of threads around here. But the sound byte description is that you pinch the fuel line closed while the engine is idling and adjust depending on what the engine does when it runs out of fuel.