Question about 1999 Mazda 626

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1999 mazda 626 has a heaving (pulsing revs) problem in the morning. It had a recent tune up, the problem goes away later in the day.

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Try checking for codes. also try the throttle potion sensor and the idle air control valve. i hope this helps.

Posted on Jul 28, 2009

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Sounds to me like a fuel related problem. When heavy accelerating more fuel is pushed through the system. I would check the fuel filter, and its possible its the fuel pump, but usually once the pump starts acting up, within a few days it will go out all together.

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