just because. the glow plugs are new, does not mean they work correctly, not at all. (yes, they can have weak or now power to them)
1: glow plugs work. really.
2: fueling correct. (fuel filter new, ?)
3: hearty battery and starter cranks nice and fast.
1,2,3, if not scan it.
In order to understand what is going on here you need the computer control system to be scanned with a special scan tool, The choices here are a dealer or a very well equipped shop that works on this make of vehicle and understands it systems and has the special tool required scan it..