I have a 2008 Chevy impala LTZ 3.9l vin is 2G1WU583681365284. 175,325 kilometres. Service stablitrak, tire monitoring system and trac control is off. All how I bought it I’ve replaced a list of 9-10 things. I noticed when accelerating it begins to jump 200-300 rpm’s. So I put higher grade fuel in it, it was driving nice then a few days ago I lost power to the engine and power’s steering. Would try to start but got the starting disabled, engine power has been reduced. It did this 2 times in the span of 500ft on a main road (not safe) Ran scans replaced the camshaft and knock sensor bank 1 as they were the only codes. Drove for 1000ft and it happened again. Worse part is, is you can’t push it off the road because there’s no steering, anyways. I’ve read through some forums (no one has an answer not even gm) and came to the conclusion it can be a mass airflow sensor, throttle body needs to be cleaned or replaced or it could be the gas pedal positioning sensor or wiring within the pedal as there’s a recall on the soldering. What I’ve gotten from this is clean the throttle body and go from there, if it continues even with the throttle body being clean get a new gas pedal assembly and see if you can find a video to diy, I brought up the mass airflow sensor as it tells the engine how much oxygen it’s inhaling and if it’s faulty and the throttle body is dirty it won’t be able to read the proper intake thus tripping out the throttle body sending the engine into a reduced power 0 starting mode. I don’t know I’m only 18. If there are any gm reps that could give a two sense or have a solution as this has been happening for years with gm vehicles not just impalas that would be great. I’m almost at my selling point as I’ve dumped money into every part on the car from hubs to pulleys and even lines, I’ve done a lot and it seemed like I was making progress but this has been a setback and a very stressful situation as I can’t say I have a reliable vehicle and with the money I’ve put into it, it should be more then reliable.

 

I haven't seen any.

First thing I would do in your place is run a full diagnostic scan with a professional scanner for clues.
Have you done the basics? Inspect air filter, spark plugs, measure fuel pressure, etc?

 

I’m gonna run a scan here in a couple to see if I can get clues then I’ll go from there, I pulled out my throttle body yesterday and cleaned it drove for 25 mins and it cut out twice everything runs healthy and smooth until it randomly cuts out but I’ll check the filter and plugs to see if they should be changed (wouldn’t surprise me if they did) after the sensors and cleaning the throttle body it’s running good. some sensor somewheres has to be tripping because after 3 mins I can start back up n go