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It probably needs a tune up. My 1998 Mazda 626 was idling very rough, so I did a tune-up by replacing the spark plugs and wires. This made the engine run better, but the rought idling continued. I took it to my mechanic, and he found a vacuum leak somewhere, and $270 later, it idles smooth as glass

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โˆ™ 2005-12-30 19:47:07
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Q: Why does a 1998 Mazda 626 have a rough idle while it is in Park?
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