Swirl flaps are used when idling.
EGR is important as well.
The missing or non working swirl flap mechanism will certainly contribute to our problems. Whether it is the root cause is hard to say.
But they will need to be fixed.
A blocked or stuck open or closed EGR will also cause idle problems
I would recommend that you remove and inspect / clean /replace the EGR, and while that work is being done get the swirl flaps fixed at the same time.
It’s all related to inlet manifold combustion performance and thus will all be contributing to the running problems.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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