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A possibility may be a loose catalytic converter shield, or loose muffler hanger or clamp. Usually a noise like this is caused by something that is loose and vibrating. These issues are usually not complicated or expensive to fix.

If you're talking about the engine making rattling noises, the timing may be off, or it may be running too hot. Also, make sure you're using gas with the proper octane for your car. An engine noise like this is called "detonation". Detonation can cause engine damage if left untreated long enough.

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Q: Why does my2006 galant make a rattling noise when you step on the gas?
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