envoy xl 4.2

Hello all. I recently installed a new head unit with DVD and am adding a backup camera. I have the camera installed, including powering the camera from the reverse lights and the RCA cord is connected to my head unit. I now need to tap into the reverse light wire from the head unit so that it...

Engine is 120K now. I feel no engine issues except "check engine light". Last few days it is permanently on, sometimes blinking. Went to dealership and they found engine misfire and lost compression (don't know actual reading) in 1 and 2. Suggested repair - $3K (new head, includes $1600 labor)...