Car stalls when RPMs drop below 500 mark

2001 CHEVROLET CAVALIER
134,000 MILES
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NICOLESMITH
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I have an 01 Chevy Cavalier Z24. When I brake to slow down, if my rpms reach the 500 mark, it usually stalls my engine. I can try to rev my engine, if I catch it in time, to get it above the 500 mark and the car won't stall. While driving, I can feel the delay in my car shifting gears as well. I just took my car to a mechanic to get a new O2 sensor. Had my car tested and the O2 sensor was the only thing that read bad. So now I'm once again stumped.
Aug 17, 2012 at 7:17 PM
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SATURNTECH9
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If you turn on the ac does the idle problem go away?
Aug 17, 2012 at 7:55 PM
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SATURNTECH9
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Also which engine do you have?
Aug 17, 2012 at 7:57 PM
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JBERNAL50
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i have the same exact problem and the ac is off when that happens
Aug 20, 2012 at 10:58 PM
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JBERNAL50
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and it wastes a lot of gas more than usual
Aug 20, 2012 at 10:59 PM
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JBERNAL50
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and its a 2.4 thats the one i have
Aug 20, 2012 at 11:00 PM
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SATURNTECH9
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Same model year etc?
Aug 20, 2012 at 11:15 PM
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NICOLESMITH
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It's a 2.4 as well. I have to leave my a/c on at all times for extra assurance but the problem still occurs with the a/c on too. Just not as quickly as with it off. Still have to rev engine to prevent the stalling when braking.
Aug 21, 2012 at 12:36 AM
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SATURNTECH9
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If the problem doesn't go away with the ac on its not the problem I thought it was.Do you have any codes in the computer?I would also try removing the idl air control valve and cleaning it.
Aug 21, 2012 at 12:42 AM
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NICOLESMITH
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I'm not sure about the code thing. But also, my mechanic had asked me today if the stalling occurs after my car warms up and it does. I don't know if that would help in answering or not. They're gonna take another look at it Thursday.
Aug 24, 2012 at 10:44 PM
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SATURNTECH9
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I would check it for codes and also clean the idle air control valve. please keep me posted.
Aug 25, 2012 at 1:27 AM
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