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Hello, does the check engine light come on or the overdrive light?
I can still further assist you. Dealers always have tool snowy other places don't have and can reduce the amount of time to find the issue. It sounds like your eve valve is stick open based on what your telling me.
Oh boy auto correct. I'm sorry. The EGR valve can carbon up. If it sticks open just slightly it can create a large power loss without making the vehicle run rough at all. This can also keep the engine rpm lower than normal.