I Have a 2001 blazer that when I get about a hour into a drive I loose all engine power and acceleration until I am dumped on the side of the road. Before that it drives like a dream, doesn't stall or loose power and accelerates without issues.

Putting an OBD reader to it I got an 02 sensor issue so I replaced the bank one sensors on both sides. Still the same issue but now it reads that the sensors have low voltage and the fuel is running lean.

I am really at a loss to what it could be since once I let it sit and cool down a bit it drives perfectly fine again until It runs at temp for a while. but when I get in it the next day I can drive a full hour without issue before I start getting power loss again.

Any help is appreciated

 

preliminary: check battery health and charge status.

inition timing

ignition control module. these are known to act up when heating up.