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  1. 08 Cobalt - Rough Idle, CEL - P0303

    Problems and Service
    My 2008 Chevy Cobalt has a CEL - code P0303. I've changed spark plugs and coil packs, but that hasn't fixed it. The car runs okay for the most part unless I am sitting at a stop light or idling somewhere, then it idles roughly and the CEL light starts flashing. I'm not a mechanic, but am...
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