I certainly no expert. Does it idle rough on start up and rev lower than normal and kinda feel like a lumpy cam If so it could be the egr valve is dirty and the valve not closing properly. I've had this problem before. The solution was taking it off and cleaning and then a new gasket. Mine threw an error code the first time but not the other 2 times. Might be worth a try it's an easy remove and clean and a $4 gasket. Good luck
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