You really need to get the vides read with Volvo or Volvo compatible equipment - and all sensor values checked.
It does sound like it could be a leak on the intake system - I would check all hoses and blank off the EGR as well as removing the plug.
You haven't mentioned it but are you getting any black smoke on acceleration?
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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