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2006 Hyundai Tucson 2.7 it doesn’t do it all the time but when it is warmed up and you are driving for anywhere from a hour to a couple of hours it starts starts misfiring. Also I have a loss of power it hesitates when going up hills. When I shut it off for a couple of mins it goes away for another couple of hours.
 

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Hey, I’m having the same issue. I’m getting coded for O2 sensors. I just had one of my sensors replaced but am thinking they all are shot because I got the engine light and the other sensors coding. I recently had the entire exhaust system replaced too. Maybe look into replacing your sensors. Once I replace all of mine I can report back to see if that helped.
 
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