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lynx
Just did a quick Google search on idling problems in the Mazda3, seems it's a common occurrence when the battery is disconnected as it resets the computer and makes the car think it's brand new... This causes the engine to rev when it should be idle... Easily fixed by letting the car idle for twenty minutes and then for another twenty with air-con on full power... This apparently lets the computer relearn what the engine is doing...
Would be awesome if this was all that was wrong... I'll report back...