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  1. Misfire and rich system, please help

    Problems & Troubleshooting
    So my 2004 ion redline is throwing a fuel system too rich code at me as well as just recently a cylinder 4 misfire. I have found it misfires under heavy throttle and usually at high rpms. I had the coils switched but i do not think that has done anything. I have spent way to much as is fixing...