Morning,
Never had a brake booster, hose or check valve go bad. I seem to recall that the check valves very occasionally go bad on old 240’s. A bad booster hose would certainly cause vacuum issues and consequently brake performance issues. Would also affect engine air mixture. I really don’t know if a bad hose would cause both your brake and running issues??
Did you set the brake fluid at the correct level? Found the link below educational.
https://grimmermotors.co.nz/brake-booster-vacuum-hose-leaks-repairs-hamilton/#:~:text=Rough%20idle%20–%20A%20leaking%20brake,as%20higher%20RPMs%20while%20idling.
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Will I buy another Volvo??? We'll see....
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