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Discussion Starter · #1 ·
Hello everyone,

My 2008 Mazda 6 2.3L with 170K miles has been having issues going uphill lately, whenever I’m going uphill for about 10 seconds I can feel the car starting to surge as you can see with the video when the car is either in 2nd or 3rd gear holding 3-4K RPM. I also hear a knock when I put 87 octane in but it seems when I put 89 in, I don’t have knocking. But the surging is still there. I’m wondering what I can do to fix this issue?

Thanks

 
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