Q: Cam Position Actuator problem - 1999 Volvo S80

Hello I believe you are referring to the variable valve timing or camshaft position actuator/solenoid, which varies the camshaft timing relative to the crankshaft position. This feature enhances engine performance, mileage, and lowers emissions. If you are able to get the problem codes causing the Check Engine light to illuminate, that could confirm whether the variable valve timing actuator is the problem, or the timing chain, guides, tensioner and chain are worn or stretched - causing related symptoms. Given your mileage, if either of these components are the problem source, I would recommend doing both a timing chain service, and a variable valve timing actuator/solenoid service. These are tightly integrated components, and wear out at similar mileage. A mobile, professional mechanic, such as one from YourMechanic, will come to your location, and repair this problem, getting you back on the road.