2002 b5.5 1.8t(awm engine code) it keeps throwing a CEL for fuel too lean?

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I have replaced, PCV valve, diverter valve, all fuel injectors, vacuum pump valve, all my vacuum lines and secondary air pump lines. I have good fuel pressure. The issues comes and goes, I can feel it run rough. The CEL will go away sometimes and come back a few days later. it doesn't go out at any specific moment. Can anyone help?