It does it in any gear and is at its worst at full acceleration
it is not noticable when accelerating slowly
and is most noticable in 4th or 5th from around 80 ks under full acceleration
and does not stop jerking untill releasing the pedal

So its when the engine is loaded up in 4th and 5th gears.

Normally we would say its an O2 sensor or AFM but these have been changed by the dealer.

As Tuna and Foxey have said I would check the Cam sensor pickups first.

Sounds like an intake cam control problem, whereby one or both AVCS solenoids are not operating properly resulting in the cam(s) defaulting to running on their grinds only under high engine loads.

The only way to confirm this is to log the AVCS load table.

Can the Camshaft Position Sensors be manualy checked for fault in any way or would I need to swap them over with new ones to see if that is the problem.

I'm assuming your dealer has read any ECU error codes that have been stored.
This would usually flag a Cam position sensor thats stuffed. Sometimes it does not though until the sensor is completely knackered.

No way to manually check them. They are pretty easy to swap out tho on the rear of both left and right sets of AVCS heads. 1 bolt holding each of them in.

Not a problem for me fit them.
just getting more sensors could be.
ill check with dealer in the morning to see if they already swapped them over
off another car.
if not i will have to get them to order some in for me
I think they just want me to leave them alone LOL

Ok will give it a shot
thanks mate - let ya know what happens

avcs has 2x cam sensors on the rear of the heads both sides.
or theres the 2x avcs cam solinoids on the front of the heads both sides, check they both have power.

I have recently replaced a cam sensor as i thought there was a fault with the sensor (which it turned out to be something else). So i have a spare sensor if you need to borrow one.

Sensors are expensive for what they are about 250ish onwards depending on where you get it from.

Are the EJ205/207 sensors compatible with the EJ257 ones. ?
I'm betting yes. :)

Thx for the chart Intra.

It's just a reluctance type sensor, so they should be interchangeable, but I'm not going to say they are.