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2000 Forester S lim
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00 forester 2.5 NA

I have these 2 codes always popping at the same time: PO440 - evap system malfunction and P0304 - Cyl 4 missfire. They always pop up simultaneously.

I don't see any relation between the 2 codes, any thoughts? I'll change the spark plugs sometimes this week but still wondering why they come in pairs...

Thanks
 
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