I just cleaned my MAF for peace of mind. I run a stock filter and the MAF looked nice and clean to begin with. Datalogging with my old defunct predator I can watch when the egr flow test fails and sets p0401.
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2004 F-350 XLT 6.0 Diesel 4X4 04/04 Build
PHP FICM & Rolled Back ECM/TCM 
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