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Check for a vacuum leak if it idles poorly. Also check for a leaky fuel injector or bad fuel pump pressure regulator.

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โˆ™ 2006-12-21 17:48:58
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Q: What should you check for on a 1998 Cavalier Z24 that has black soot on spark plugs and loping idle when warm and P0172 rich fuel and pending P0401 insufficient EGR backpressure detected code showing?
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