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Discussion Starter #1
Today noticed a change in idle, normal at 750, but when gear selected (auto box) it starts to fluctuate down to 500 and back to 750 constantly.



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Either a vacuum leak or MAF going/gone are my first thoughts. Never experienced it on the cx3 but have on other cars.
 

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In a last couple of mazdas ive owned the intake tube is absolute garbage for longevity. That same flexible rubber is prone to leaks and, as experienced in my old mazda 6, can glaze over and crack. Might not be what your issue is related too but something im monitoring in the future.
 
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