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Q:

Car idle rough, some stalling, fuel filter changed, no change. Speed reduction. on 1999 Volvo S70

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
heard some air wooshing under hood while attempting to accelerate. not running on all cylinders. Can it be vacuum leak rather than fuel problem?
(1) Answer
ANY DTC"S/??.OR CHECK ENGINE LIGHT ?? WOULD HELP.IN THE DIOGNOSIS.BUT FOR THE AIR WHOOSHING SOUND, I WOULD START BY CHECKING FOR ANY TORN TURBO INTERCOOLER RUBBER HOSES.ONE IS LOCATED JUST OBOVE THE RADIATOR,ONE AT TURBO ISTSELF.AND ONE LONG HOSE ON THE LEFT SIDE OF THE AIR FILTER BOX ,COULD BE A COIL,OR A BAD SPARK PLUG, FOR IT FEELING LIKE ITS NOT RUNNING ON ALL FOUR CYLINDERS.