I am the owner of a 2015 Jetta TSI with <50,000 miles on it. I have previously had no issue with the car. On Thursday, when I started the car, the EPC light came on, but there were no additional symptoms. I called and made an appintment at the dealership as quickly as I could. The following morning, when I started my car, the car was slightly shaking and the RPM gauge was flipping back and forth between 900-1,100. I restarted the car a few times and on the third try, it ran completely normal and I was able to drive it without a problem or any additional symptoms. This happened again the next time I started up the car, when I was trying to take it to the dealer.
The dealership told me I had a failed throttle body and would need a new one. They stressed it was the actual body, not the sensor. But, i have had multiple people with extensive background in cars tell me that this diagnosis does not seem consistent with the symptoms I was having and would be very rare in a car with my mileage. Any ideas for what to do/what could actually be wrong?