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Q: Why does the car stop suddenly?

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We will be driving the stratus, and slow down to stop at a red light. Once slowed down and stopped, the car shuts off. It doesn't have issues starting back up again, but it's inconvenient to stop at a sudden time. Could it be the alternator, the battery is going out, the batteries terminals need cleaned or the plain terminals need replaced?

My car has 291000 miles.
My car has an automatic transmission.

A: This may be related to a dirty or failing i...

This may be related to a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle's computer which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed. This is all controlled by the idle air control valve. When the engine RPM drops below the normal range of 750-800 RPM (for most cars), this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your idle air control valve.

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