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Hello, I'm Brandon- VW tech.
It looks like the accelerator pedal position sensor has a problem.
The pedal sensor communicate to the throttle sensor which open and close the air going into the engine.
This is one possibility.
The tech will need to link up a scanner and read the trouble code.
The code will give you and the tech an idea what is really wrong with the car.
It takes about 10 minutes to retrieve and define the code.
If is the pedal position sensor you are looking at about $480 repair.
Please rate me positive for the prompt service and thank you for supporting the U.S. auto tech.