westystrol

G`day, welcome to the forum.
Technically, start up shudder is not or it shouldn't be caused by MAF sensor.
You could try disconnecting it and than try to start.

If you have access to multimeter you could measure MAF outputs at idle voltage should be around 1.7 to 2.0 V.

Even better would be access to ECU Talk cable/interface and software, with that you can log engine sensors values to see what is happening.

What you also could quickly check if the turbo charger VNT arm goes up/raises when engine starts and goes down when engine is off. Thast would elliminate vacuum control as source of trouble. Like vacuum leak or VNT control solenoid issue.

To me, this could also be like classic fuel starvation. Check or replace fuel filter as needed.

I'm guessing that if you have EGT gauge you have boost gasuge as well. So boost pressure would also be indicating lower values.

There is also a possibility that EGR valve is stuck open perhaps partially this ofcourse only if you haven't blocked already.

Cheers