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Here's How A Bad PCV Can Ruin Your Engine

We don't mean to be the harbingers of doom, but it's unwise to keep driving if your car's engine has a malfunctioning positive crankcase ventilation (PCV) system, particularly a bad PCV valve.
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I paid for new spark plugs, but the engine still misfires and the shop says it’s unrelated

It’s the kind of moment that makes anyone squint at their receipt like it’s written in a secret code. You pay for new spark ...