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it sounds like torque converter shudder. it will give that feeling when the clutches slip.
how long since you changed the oil/filter in the trans???
codes will only set with electronic failures. you have mechanical issues.
the fact that you had a converter shutter concerns me. the clutches may still be slipping and if they are bad enough the additive will not completely stop it.
other wise, it could be a clutch failure internally or valve body. hard to pin point from here with out visually inspecting
I agree. hard to do from a distance without seeing or touching
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