I understand your symptom. I'd second swirl flap actuator. May actually be worth giving the EGR a clean too, But turns out the linkage was disconnected because the linkage had jammed up.
The only other thing that hadn't been adressed when I bought the car was the EGR was chockers of soot.
Replacement of flaps (ebay) and an evening scraping powdered goo out of the EGR, stopped that issue outright.
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'Designed by a computer, built by a robot, and driven by a f***ing nutter'
'09 XC70 SE - 2" lift, D5 225bhp, poverty spec.
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