Other Fuel System Fuel Injection System problems of the 1999 Volvo S70

Regarding Volvo throttle control July 2001-purchased 1999 S70 with 22,600 miles; cruise control quit, warning lights lit, car began decelerating. Dealership said check gas cap securely-fitting. After restarting, cruise control worked and warning lights off. 30,000 mile service- told again to check gas cap whenever cruise problem occurred. August 2002-using cruise control, acceleration without reason. Immediately, cruise control quit, car decelerated, warning lights on. Normal function with manual acceleration. By this time, I had "learned" to restart car to get warning lights to turn off or to get cruise control to start working. At destination, car wouldn't restart. Tow truck driver jump-started battery. Ets warning light still on. Wrote to dealership October 28, 2003, regarding ets warning light. At 37,500 mile check-up, I was told car required only normal servicing. When I left dealership, ets light no longer on. Later car began idling roughly and didn't accelerate as smoothly. After 37,500 mile service, car operated more as expected. Within weeks, again idling roughly and not accelerating properly after turning corners. Dec. 31, 2003 (38,695 miles), Volvo towed to dealership because unsafe to drive. When turning, car barely moved forward. Also, motor stalling out during acceleration after turning. Noise sounded like it emanated from power steering. Power steering rack replaced. After servicing, engine's acceleration better for few months. (did dealership cleaned throttle during service?) rest of this sent in separate description due to space limitations.