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But the cause might be anything from a hard-to-find vacuum leak to dirty fuel injectors, low fuel pressure, a weak ignition coil, bad plug wires, or compression problems. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isnât getting enough throttle opening. The cause is often a problem in the idle air control system. The first thing to check is the intake vacuum with a vacuum gauge.
If the engine misfires at certain conditions but not all the time, it's called intermittent misfire. The engine computer or PCM can detect a misfiring cylinder by monitoring the engine speed. Once misfire is detected, the PCM sets the trouble code and turns on the Check Engine light to alert the driver.The OBDII trouble code P0301 means that the cylinder number 1 misfires.hat can cause the engine to misfire: Fouled spark plug-one of the. common reasons causing misfire. - problems with the ignition components: spark plugs, ignition wires, coils, distributor, ignition module.