I have a high-mileage car with around 340,000 miles on it. Two days ago, while I was stopped in the traffic and was about to keep driving, the car couldn't move. The engine was running smoothly though. I tried downshifting to second gear but still nothing. After I downshifted to first gear, the car started moving again. A bit later, the car became motionless again and unresponsive to any gear. It wouldn't even go to reverse. Yesterday I took it to the mechanic and the car had no issues whatsoever. The mechanic took it for a faster ride and didn't find anything wrong. Do you have any idea what might be wrong?
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