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  1. 2011 Subaru Outback Sport - Error code P0304 following head gasket replacement and loose vacuum hose

    Problems & Maintenance
    I have a 2011 Subaru Outback Sport that I had head gaskets/timing belt/water pump replaced on 2 months ago. Since then, it ran and idled rough, but not horribly. My friend/mechanic looked it over and found a vacuum hose completely unconnected (not sure where the hose was connected, but it was...
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