Question about 1999 Mazda 626

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Engine stumbles and shakes like it wants to die every so often when AC is in use?!

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On your vehicle there should be a IAC Valve that the computer uses to increase the RPM when certain loads are activated, seems that your RPM when the AC does come on is lower then normal causing the stumble / shaky idle. I would have someone look into a few things:

  1. Correct Idle with all loads off ie. AC, heater and so forth
  2. Timing
  3. IAC Valve and passages

Posted on Aug 27, 2010

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