Question about 1999 Mazda 626

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Idle rough in R, D, fine in neutral

Hey gang, I have a 99 Mazda 626, 4 cyl, and have an annoying issue I am dealing with. When the car is in drive, L2, L3, or reverse, but not moving, the idle is rough. Not to the point of choking out, but rough nonetheless. When I put the car in neutral and park, it's smooth as a baby's bottom, and so quiet you don't even know the car is running. Someone told me it might be the mass air flow sensor, but it's when the car is not in motion - does that sound right?
(I've already done a tune up, changed plugs and wires as well)
Thanks!

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  • davlar70 Feb 25, 2009

    Car will stall sometimes when you are slowing down to stop (automatic down shifts and then rpms drop car shuts down). I have replace IACV, mechanic saying transmission needs replacing @ 3,100.

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Hmmm have you had the timing belt changed? is it due for one? that can cause a some rough idling.

Posted on Apr 27, 2010

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