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Originally Posted by Moneypit SEL
HC = unburnt fuel. High HC does not necessarily = too rich. A lean misfire can also cause high HC. Until you determine the cause of your rough idle, it's just guessing.
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This is actually what my indy told me, unburnt fuel, which is what he suspects to be leaky injectors. In fact, the CE light comes on and off when I step on the gas generously.