As a followup, This occurs while driving and more often while slowing down but I have had it lunge at higher speeds. It's a quick burst and its done. The vehicle is Auto transmission and the input I got was related to the clutch lock-up solenoid. The vehicle does not bog, the engine is spotless and ...

I bought a 99 S70 Base model from a dealer recently for my son to drive. I have a '99 GLT as well. The car has a random acceleration and lunge that occurs about 2x per week. It makes it difficult for a 16 year old to drive. Dealer cannot replicate the issue on gauges so they won't speculate. They ha...