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that seems like a much bigger problem than a little sputteringwell hell...the sputtering has immediately became my smallest problem now xD hope you can find what's going on jfroh.
ill have to try the pcv one of these days. as for the plugs there brand newGet a new PCV valve they are cheap it sounds like a blow by issue as far as the dirty filter. Check the compression and vacuum pressures and what do the plugs look like.
that seems like a much bigger problem than a little sputtering