2012 Chevy Impala

Lol that mechanic should of known better.. a dirty throttle body is not going to trigger the stabilitrak and traction control and make your car almost die this is going to be something affecting the data network more than likely esp given its intermitent nature. It can range from can wires rubbing ground or a module crappong out

When the car is dying doe any of your gauges drop out.. thatll help isolate if its a low speed data line problem

The rpm's jump from 500 to 900 and continually jump up and down. I dont recall any other gauges dropping out though.

When you hooked the scanner up was it a no communication issue or just no codes?

Of u can get the car to act up again and all the lights to come on see of certain things are still functional like door locks any of your ac/heater controls

I think it was a no communication issue. I am pretty sure everything works. I do know doors locked, windows rolled up and down, radio, ac was working, wipers were working yesterday.

With all the symptoms and no communication its possible the CAN data network is being affected.. multiple ways it can be affected. So just something to consider.. if you have a volt meter and you can get the car to act up you can check voltages on pins 6 and 14 of the dlc and the both should show around 2.5 volts with the key on.. 0 or battery voltage is going to be a problem