An internal combustion engine needs three things to get going: Air, fuel, and spark. The throttle body and intake plenum feed air, while injectors spray the right fuel mix into the combustion chamber. Meanwhile, the spark plugs ignite the volatile mixture to produce power, and the cycle repeats. If anything goes wrong with the air, fuel, or spark delivery, the engine will refuse to start, idle roughly and run poorly, or die immediately after starting. It’s the reason why
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