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Q: Why does my car stall everytime I come to a idle stop at a light? on 1990 Chevrolet Corsica

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The idle fluctuates up and down it also stalled and would not stay running if put in gear
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It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. It could be a vacuum leak, an idle speed control problem, leaking EGR valve, poor electrical connections, many things is the check engine light on ?
the check engine light is not on and I replaced the throttle positioning sensor last night and it still stalled on me after that was replaced.