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Hey im new here and im looking for answers i did rutine spark plug change in my 2017 wrx and it started misfire on 3 and i changed the the coil also and the misfire is still there and i changed all plugs with in 3 days and cylinder 3 the plug came out blacked if car has no tune just bolt on charge pipe cold air intake and blow off valve if anybody can give me advice i appreciate it thanks
 
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