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At full throttle my 08 legacy 2.5 gt stutters when it gets to about 4000 rpms to about 5000


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Get a code scanner, or take it by an auto parts store and ask them to scan the check engine codes. Post any codes here and we can work from there.

 

At the very least you should do a basic tune-up. NGK Spark plugs, Subaru OE PCV valve, new air filter, new fuel filter if its replaceable. Check all of the vacuum and PCV hoses and replace any that are loose or cracked.

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