P0300 means multiple cylinders are missing — which makes it trickier than a single-cylinder code.
Random means look at what is shared
P0301 blames one cylinder; P0300 says several are stumbling, so the cause is something they share: fuel pressure, a vacuum leak, a batch of worn plugs, bad gas, or a sensor feeding the computer lies. That is why P0300 diagnosis starts at the systems, not at swapping one coil at a time and hoping.
Quick tips
- A P0300 right after fueling up can be a bad tank of gas
- Rough idle that smooths at speed suggests a vacuum leak
- Bring records — knowing the plugs' age shortcuts the whole diagnosis
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