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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.
For vehicles with a coil on plug ignition system, a bad ignition coil would cause a misfire in one or more cylinders at once. The engine will still run, albeit quite powerless, and rough. Some coil on plug ignition coils actually control two cylinders with a waste spark system (as described above).