Hey Scotty I have this 2009 Subaru Forester 2.5 X premium, it has 189,600,, and an automatic transmission, i changed the power steering pump and belt today, i rev the engine up to 4,500 rpm’s sitting in the driveway and ever since then my car has engine hesitation, it has stalled on me at stop signs a few times, And when you start it the rpm gauge says that the engine rpm’s were going up and down for a second then eventually fix it self but then do it again. it showed a check engine light and the scanner said 2,3 and, 4 cylinder misfire. In the past I have had to change spark plugs, coil wires and fuel filter and that’s it.
Well it's Miss firing so start with the simple things spark plugs wire stuff like that and if it's further than that perhaps have the fuel injectors pressure cleaned dirty fuel injectors can cause misfiring too