..although I drove an omega with blocked breathers for some time. It didn't behave like this does. It's a drop in power. But why...?
On these, shitty breathers tend to give stickiness to DBW throttles (or in extreme cases, actually knacker the gears in the servos - but I've only ever send that once myself), which was my reasoning for suggesting cleaning.
But I'm not convinced in this case, hence wanting to see trims (and/or MAF at point it fails)
This is at wot in third iirc, or was it in second... Certainly wot, at a tad over 5k rpm. So given the road in question, more likely second.
So not near rev limiter.
Not near a gear change point.
Not during throttle movement. (Assuming no fault of course, as it should be wide open and the symptom would suggest it's trying to close if a Tps fault)
Not near a multi ram movement. (Iiuc?)
Basickly engine at full load at 5,200 odd rpm. Slight hesitation/drop in load until 5,500 and off it goes again.
I'd be looking at engine management I think? O2 or Maf or spark. ....fuel filter?
Something breaking down at full load anyway.
There is a concern the box is trying to change gear. Which is sort of feasible. Box replaced with matching ecm from same dinar vehichle as the box. Known good.
Has the fluid level been re checked since the box change Paul..?