1995 Saab 900 will not idle correctly

1995 SAAB 900
146,141 MILES • 4 CYL • FWD • AUTOMATIC
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FGREELEY
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car runs fine on the road and freeway but when you come to a stop or red light the idle will drop below 1000 to 900 then 800 then die if you press on the gas it will shutter before it starts to to go again.
it wiil not pass smog at 15 mph test but does pass at 25 mph test. need help can't keep spending money on the car.
Aug 27, 2008 at 11:35 PM
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RASMATAZ
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Last major tune-up?

Could be vacuum leaks being caused by the EGR and PCV valves or its leaking somewhere else.

What is your HC and CO level at idle.
Aug 28, 2008 at 12:36 AM