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hello i have a forester 01

just recently i have had issues where it feels like no matter how hard a press the gas the engine just doesn't wanna go faster until suddenly it catches itself and speeds up. also while idle the engine vibrates violently and sputters almost sounding like it is going to shut off. only recent thing i have had done was oil change and fluid check. thank you
 

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2002 Forester S Automatic
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Are you getting any CEL codes? That's where i would start. How many miles on it? Has it had regular maintenance?
 

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change out the pcv valve and the egr system and see it that doesnt help ,,,,,,,,,if not clean and right these will make rough idle, and lower power on acceleration, , if not ,then maf sensor, butterfly valve edge to see if it i
s clean of carbon residue , and fuel pressure , plugs too if you can do so, and if this is a turbo model check your turbo and bov system to see if it is maintaining correct pressure
 
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