Question about 1993 Mazda MX-6

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Why does the engine idle bounce up and down - 1993 Mazda MX-6

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I would check the ends of the medium sized rubber hose that goes to the brake booster from the inlet manifold, as well as all those little rubber vacuum hoses that are used for pollution control. They tend to go hard and / or split where they connect to the metal piping if they are over 10 years old, allowing air / vacuum leaks into the inlet manifold which upsets the idle mixture causing rough / uneven idling. If the hose is long enough you could trim about 1/2 inch off the end and reattach but if the hose is hard and brittle the best option is to replace any suspect hoses completely. Most auto parts retailers sell the hoses cut to any length you need.

Posted on Nov 07, 2010

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You might need to do a tune up as i am not sure when you performed a last tune up. Assuming your battery is connected tightly, the car can have idle issues because of bad spark plugs and/or bad coil packs

Posted on Nov 07, 2010

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