P0300: Random/Multiple Cylinder Misfire

P0300 means a misfire across more than one cylinder (random). It causes noticeable shaking, weak power and sometimes a flashing check engine light.

Symptoms

Rough idle or shaking on acceleration, weak power, higher fuel use, and a possibly flashing check engine light (risk to the converter).

Common causes

Worn spark plugs / ignition coils or wires, a vacuum (air) leak, dirty fuel injectors, or low cylinder compression. Start with the cheapest and most common: spark plugs.

Fix in order

Check plug/coil age, look for an air leak, then injectors. Mowtar AI links the code to your service history and ranks the most likely cause.