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System too lean often means you have a fuel delivery problem like clogged injectors or a bad fuel pump. One easy and cheap culprit is often the fuel filter, a filter that's getting clogged can let enough fuel to idle properly, but then won't let enough through for higher revs. I'd start with that as the part should be less than $20 and you can do it yourself ...


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The culprit was a seized EGR valve. I was under the impression that emission related issues would always throw a CEL. Turns out that I was wrong. The code reader revealed a P409 without CEL, later steps were easy. I removed the EGR valve, found it stuck, cleaned and reinstalled it.


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