So far as I can tell my car doesn't have an EGR. There's a PCV breather box on the back of the block and it has a hose that goes straight to the intake manifold. I replaced the valve on it about 4 months ago because I had no idea how old it was. Turns out it didn't need to be replaced but it was ~$2.
There's also a breather hose from the valve cover to the intake manifold.
Any possibility of failure here causing this?
I'll grab some plugs next time I'm out and price-check an O2 sensor.
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