One problem related to speed control linkage has been reported for the 1999 Volvo V70. The most recently reported issues are listed below.
Electronic throttle module etm failure in 1999 Volvo xc70 VIN yv1lz56d9x2569903 64189 miles at failure. Throttle in car would surge / cut out at speed for week leading up to failure. Etm light came on and would not go off. Etm unit had to be replaced to fix problem $970.