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Try new ignition coils and a compression test . I have a Wrx that was missing on third cylinder , I had swapped the coils around thinking the misfire would move to diff cylinder , it didn't . I ended buying new plugs and coils and it fixed the misfire with a much smoother idle .
Compression test can be a lil pricy 1-2 bills but it will at least tell you a bit more ie if you have a cracked cylinder , bad head ect
Try finding cheap used coils to try and see if that helps any ?
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