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Will the transmission cause your 99 ford expedition bog down and sputter when accelerating 4.6liter?

A faulty transmission in a 1999 Ford Expedition with a 4.6L engine *can* cause bogging down and sputtering during acceleration, but it's not the only possibility. Transmission problems often manifest as slipping, delayed engagement, or harsh shifting, but a severe enough issue, like low transmission fluid or internal damage, could lead to a lack of power that feels like bogging and sputtering.

However, other components are much more likely culprits for this symptom:

* Spark plugs and wires: Worn or fouled spark plugs are a common cause of misfires, leading to sputtering and lack of power.

* Ignition coil: A failing ignition coil can cause misfires in one or more cylinders.

* Mass Airflow Sensor (MAF): A dirty or faulty MAF sensor provides inaccurate air/fuel mixture readings to the engine computer, leading to poor performance.

* Throttle Position Sensor (TPS): A malfunctioning TPS can cause similar problems to a faulty MAF sensor.

* Fuel injectors: Clogged or faulty fuel injectors can prevent sufficient fuel delivery to the cylinders.

* Fuel pump: A weak fuel pump may not supply enough fuel pressure, resulting in poor acceleration.

* Catalytic converter: A clogged catalytic converter can restrict exhaust flow, leading to power loss.

In short: While a severely damaged transmission *could* contribute to bogging and sputtering, it's much more likely that the problem lies elsewhere in the engine's fuel delivery or ignition system. A proper diagnosis requires a mechanic to check various components and test their functionality. Don't jump to conclusions about the transmission until other, more common issues have been ruled out.