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What would cause a 99 Chevy Malibu 4-cylinder idles rough sputters dies worse in gear dry black soot on plugs replaced both o2 sensors and spark plugs and boots now exhaust has black smoke?
Wiki User
∙ 15y ago
Check the air filter, fuel injectors, EGR valve and temperature sensor.
Wiki User
∙ 15y ago
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What sensors are on the exhaust manifold and are those also oxygen sensors?
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