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As you can see from all the responses, a rattling noise can be caused by all kinds of things, from loose wrenches to things inside the engine/transmission, loose heat shields and exhaust, or even suspension. I suggest you start the engine, leave it in neutral (parking brake on) and look inside your engine compartment. Rev the engine while you're looking at it, and maybe you'll be able to narrow down where the rattle is coming from. Heck, you may be able to see something loose and vibrating, put your hand on it and the sound goes away. If you can't find the rattle, it may be worth getting someone to rev the engine while you're under the car so you can look for something loose down there. Wear nice thick gloves if you're going to try grabbing hold of the exhaust or heat shields. If the "rattle" increases speed with the engine speed, it's probably something that moves with the engine. This would be a good time to listen to the bottom-end of your engine, if the rattle is coming from inside your oilpan it's probably time for new bearings.
If the rattle doesn't happen when you're revving the engine, but only when the car is actually accelerating, look to the suspension and motor mounts.
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