Doubt it is the intake manifold gasket. When the intake manifold gasket went on my 90 240 it sounded like a jet. At the very least there should be a hiss.
Suggest doing a thorough search for vacuum leaks. Good starting place is the throttle body hose. They don't last forever. There can be hidden cracks which will throw off your car's fuel/air mixture. Also check all vacuum hoses. Pay special attention to the ends and elbows. More spots for hidden cracks.
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Will I buy another Volvo??? We'll see....
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