I have a 2002 S80 2.9 non turbo and have a rough idling issue, at 700rpm. 247,00 miles, bought last year. Have new plugs, 1 new coil, new MAF, new air filter, cleaned throttling valve, used Seafoam, then Gumout to clean fuel injectors via the gas tank, checked hoses for vacuum leaks. I get a "l...