Q: Idling issue

asked by on December 14, 2016

My Stratus idles rough when started to warm up and has stalled a few times. Has also stalled a few times while braking to a stop. If i drive when cold my rpms bounce and the car doesnt want to accelerate for a few seconds and then returns to normal. This has happened three or four times. I recently changed spark plug wires and the plugs. Any help would be appreciated

My car has 143000 miles.
My car has an automatic transmission.

This is a common problem when the idle air control valve is dirty or faulty. The idle air control valve monitors 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 and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. This is also an important function when starting the motor as it allows the motor to run and idle on it’s own once the motor fires. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve making the transition from a higher RPM back down to idle speed while adjusting the air/fuel ratio constantly to allow this to happen smoothly. When the engine RPM drops below the normal range of about ~800 RPM, 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 replace your idle air control valve.

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