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Q: my car is rattling when going up a steep hill am driving 30mph why is on 2008 Mazda Mazda3

this doing this?
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Probably 'lean' condition or running hot. MANY possibilities-- should be scanned , if no trouble codes they can monitor sensors for readings out-of-range. NOT parts house 'code reader' , real scanner with Mazda compatibility needs to be used ,with someone that knows how to 'read' it.
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