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Bought an 2008 STI Hatch about two weeks ago and some how my car started acting funny, when I try going over 3500 rpm my car stalled and felt like misfired and when I’m on high speed like 75 mph I don’t feel the turbo boost. I change out the old spark plugs with the new NGK and still does the same thing! I’m new to these cars so I don’t really know much about them
 

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Check for vacuum leaks to crankcase. My 2013 did that because vac line under throttle body came off somewhat. Pushed it on, zip tied and good to go. Also possibly have your mechanic check cylinder pressures
 
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