I am not sure about this but when I had low coolant because of a leak, the car would act the same. I am sure mine was because the sensor didn't pick up the warm water and never registered anything but cold. So it started rich and always bogged, hesitated so bad it was very hard to drive. That may be your problem, a cold start sensor going out. Of course that is just my guess and I don't know if a bad sensor like that puts out a code.
Let us know.
Russ
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