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Sounds like a problem with the idle air control valve. The battery would not cause this, as when the car is on the computer provides the power through the alternator. The reason it could be idle air control is that the computer increases the alternator output when current draw increases, which increases the load on the engine. Normally it also compensates for this at the same time by allowing more air into the engine, and it does so through a valve on the throttle body (or with the throttle itself in the case of an electronically controlled throttle)

Check out your alternator and or voltage regulator! That's most likely what it is.

A bad alternator would NOT cause the vehicle to stall. Neither would a bad regulator.

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Q: When the Toyota 1986 mr2 is completely warmed up and idling with anything on that uses a decent amount of power the car idles low and sometimes stalls and battery is old would replacing it solve it?
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