I just recently bought a 2003 Pontiac Grand Prix GT V6 four door. After buying the car realized the dash and taillights were not working. I brought it back to the lot and they fixed the tail lights and dash lights. They said the box was just sitting on the frame and was shorting out wires but now was fixed.
Ever since this was fixed when I run the AC or the heat or defrost the car starts to struggle or jerk. Sometimes the Airbag light or the low oil level light will come on (the oil level is fine) and sometimes the gas gauge will drop a little, lastly it will sometimes stall when slowing down when pulling into a parking lot.
When I do NOT run the AC or heat the car seems to run and drive pretty smoothly in general. Yet sometimes I do get an air bag light come on or a little jerk when I slow down at the light or in a parking lot but nothing like when running the AC.
The mechanic at the car lot is stumped at what could be causing this. I think I need to find a new mechanic.
But anyone have a clue what would be causing this? A sensor? The car drove fine until the dash and taillights were fixed.