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If you haven't been told yet, then let me be the first. Go get a manual for your car.
You have , what seems, from your descriptions, some serious issues and you are asking Mechanics 101 questions. You need to familiarize yourself with the basic workings of your SL before you have a hope of fixing it yourself.
Either that, or find a mechanic.
And don't drive your car if it is making unfamiliar and "bad" noises.
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