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Answered 2009-02-06 18:44:35

It's also possible that the battery is weak. Have the charging system -and- battery tested to ensure that the voltage isn't dropping below specified levels when the engine is at idle. Most alternators are designed not to engage or to begin generating power until the engine RPM's excede a certain value. This is because the alternator imposes quite a load on an engine, and could cause one to stall if engaged at idle. So the car electrical system, including the ignition, is running off of the battery at idle. Usually, the alternator will engage by 1200 RPM.

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