Hi Mate
Sorry I can't help directly as I don't have experience with that engine, but I think the best thing you can do would be to get a diagnostic scan with VIDA - the proper Volvo diagnostic tool. It's reasonably priced from eBay or sellers on here. You might even be able to find a local member who can help.
Even if there isn't a fault logged, VIDA has the ability to graph parameters as you drive - so you can spot things yourself.
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