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Question
Patsharai
I replaced the fuel pump in the tank of my 07 Yukon xl yesterday due to a check valve that wouldn't retain fuel pressure after being parked for a few hours. The truck usually took two tries to start. Now that I have that problem seemingly taken care of, I have two warning lights coming on. It fluctuates between stabiltrac and traction control and then both will go out. It causes a hard shift between 1st and 2nd when the light is on. But then the light will go out and everything is back to normal. Happens with the car idling in park and while driving. I have read that somehow the throttle body can cause this, but I'm wondering if it is possible for my new fuel pump to cause the problem as well.
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