Q: Would a leaking valve cover gasket cause a misfire?

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My valve cover gasket on my truck is leaking oil and I was wondering if this would cause a misfire and a RPM decrease while idling?

My car has 137000 miles.
My car has an automatic transmission.

A leaking valve cover gasket can cause a misfire if oil is leaking into the spark plug wells. But that is usually not the problem. Most often the misfire will have a separate cause. But a leaking valve cover can cause smoke, bad smells and even fire, so it is in your best interest to take care of it right away. If it solves the misfire problem, that much the better. In either case, you can contact YourMechanic to have a technician come out to your home or office to replace your leaking valve cover gasket and check out your misfire right there on the spot.

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