Thank you for the video . Your symptoms are the same as mine. Although I have the 5.3 liter v8. But acting very badly. Stall, hesitation takes off suddenly , rpms drop from 600-700 to 100 or less then stalls after running rough and blows black smoke and “ ash “ I dont know but leaves a black mark on the ground in my drive way when you push the gas to idle up and runs like a bucking horse.
Update to what my Envoy has been doing. It ended up being both upstream sensors located on the exhaust pipes before both catalytic converts. The 5.3 liter 4x4 edition XL that I have has two catalytic converters. But yes it was the sensors .
Sorry to be a stickler, but 27 seconds into video you say the code is p1345, then repeat but say the correct code of p1435, and that code refers to the particulate matter sensor. However, the sensor you replace is a CPS. and the code for this is p0340. also, thanks for the video. took me 5 minutes to fix!
Maybe with all the camera we can see what you're doing what you actually working on but you keep moving it so I don't even know if you're on the top or bottom
