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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.
Problems with the ignition system, fuel system, emissions system and overall engine condition may lead to misfire. Ignition system components, including the distributor, distributor cap, rotor, spark plug wire set, coil or coil on plug boot, can create misfires if they have failed.