One problem related to accelerator pedal has been reported for the 1999 Volvo S70. The most recently reported issues are listed below.
The rpms would drop to 500 or below, and the car would stall. Took vehicle to the dealer, and they cleaned the throttle. Within 2-3 months, it was the same problem or worse. This was a safety issue. The consumer sent Volvo a letter, and they said NHTSA was in the middle of an investigation and wouldn't do anything until the results were published.