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I recently bought a '04 F350 from a used dealer that i was told to go to. I test drove the truck quite a bit and found no problems with it. After buying it, they threw in a few new parts for the truck, including a new sensor. I'm rather mechanically retarded, so bare with me. I believe it was a new O2 sensor, or maybe EGR sensor? I can't remember, I just know it took them like 15 mins to replace it.
Anyways, after they replaced it, they brought it up to me and told me it would stutter when idling for a while. They said i would have to "drive the **** out of it" before the sensor would basically teach itself. Well 400 miles later, it is still doing it. It will do it for about the first 10 mins of running it, but will eventually stop stuttering and act normal. I will say its getting better, but something doesn't seem right.
It'd help if we knew exactly what the sensor was. You're posting in the 6.0L Diesel forum, and the 6.0L Diesel doesn't have an O2 sensor, nor an EGR sensor.
In fact, there isn't anything on the 6.0L that I can think of that normally cause a stutter until "the **** is driven out of it."
I think I'd be going back to the dealer that sold it to you.
If you can't or don't want to do that, try to find out what the sensor was. Also, get it checked for codes.
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