I have a 2005 Ford Taurus 3.0 OHV, engine idle ramps up and down about 50-100 rpms above/below normal. The short term fuel range in pcm -1.5% lean both banks. Long term fuel is about 3-4% rich. Once in a great while code PO300 occurrs. Engine analyzer don't indicate anything other than short term fuel being lean? Any direction would help. Thanks
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Ford Taurus; 2005 Engine rpm ramps up/down 50-100 rpms no codes automobile forum
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