2005 Other Mazda Model s rough idle /low rpms

2005 MAZDA
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MAZDA3CANADA
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2005 Other Mazda Model s 4 cyl Wheel Drive Type unknown Automatic 50000 miles
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I have a 2005 Mazda 3

Almost everytime I stop at a light my rpms drop to about 400 and then the car starts to shutter (like a shake) like it is going to stall but doesn't....I only notice it after the car has warmed up.

I have had the dealership look at it 3 times and they have no clue how to fix it. The computer reads nothing and the engine light does not come on. I have had the purge valve replaced....but still nothing.

Any suggestion would be great and appreciated!
Dec 9, 2007 at 4:59 PM
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MHPAUTOS
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Hi there,

I presume that the dealer has inspected the normal tune items. I would be looking for a vacuum leak which will up set the idle mixture. also i would be doing a live data read with a plug in diagnostic computer, looking at throttle % at idle, and other relevant readings.

Mark (mhpautos)
Dec 9, 2007 at 5:20 PM