Hi. I have a 2008 Subaru Outback LL Bean Edition with a 3.0L 6-cylinder 5-Speed Automatic transmission, 105K miles. I’ve noticed a problem the last couple days where, when sitting at a traffic light, etc., the engine will be idling properly and then the car will suddenly shake a little and feel like it wants to stall. It then recovers and everything is again OK. This happens within a few minutes of the car starting, after sitting for a few hours. I also noticed the car have a difficult time starting, after being shut down for about two hours. I’m wondering if car parts might need to be cleaned (throttle body, etc.), and what specific Sea Foam products might help in this situation? Any advice would be rather appreciated. Thanks.