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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.
In the simplest of terms, a misfiring cylinder is a cylinder that's âdeadâ, because it's missing one of the 3 things it needs for the combustion process to take place. It'll be missing fuel (gasoline), or spark, or air (compression).ere are a few other symptoms you'll see with a misfire: 1  The check engine light (CEL) will be on. 2  One or more misfire codes (P0300-P0304) will be stored in your pick up's PCM memory (PCM = Powertrain Control Module = fuel injection computer).