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Do you till have the AIV on it (valve that injects fresh air into the exhaust to warm up the CAT quicker). They're know for going bad (my personal E had the same issue). Basically the valve gets stuck open, and allows fresh exhaust gasses to get sucked into the intake stream. Fucks the maf up and the fuel mixture. Otherwise your actual egr may be getting stuck open as well. Youd notice it more towards idle ( egr should be closed at all times)
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