Engine cut
 

I've got an Elite 1500 in a turbo S4.
I'm experiencing an issue where the engine will shut down if I put it in gear and put it under load. If I keep it in neutral, it will momentarily cut (fuel or ignition cut) at around 4000 rpm.
What should I datalog in order to diagnose? I have *somewhat* of an idea of the ignition, but very little knowledge of how to diagnose injection via datalogging.