My wifes 01 Sunfire began running poorly. She went to Autozone and they gladly pulled the code and sold her a Throttle Position Sensor.
After installing the part, the problem remained. Took it to Pep Boys at 4400 S. Semoran Blvd., Orlando, Fl. to get a professional assessment of the problem.
They ran a diagnostic, cleaned the battery, installed new plugs and wires and the problem remained. Finally they put a new Throttle Position Sensor on for free and that cured the problem. At least they didn't charge me for that. Dave, the manager at the store does not get involved and gives the impression that your attempts to get some help are an inconvenience to him.
Jose the service advisor, was cordial but apparently needs to get new diagnostic equipment or locate a new person to operate it. I don't like to say that I will never, but I will try to find a more knowledgeable shop to do repairs on my vehicles in the future.