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Please clarify. Is the Engine Turning over, but not Starting? Or is it not turning over at all?
if the engine is trying to start, like you stated, then the battery and starter are good. if you have 100K on the car.. have you ever had the time belt change??? not sure if it's the time belt also because if it's broken, the engine shouldn't even make any sound of trying to start.
You need to give us some kind of history on your car. when was the last time you had a tune-up done?