Hi. My LS400 (1996 65K miles) sometimes feel like it is losing power and has a weird noise (sounds like an RC car) when it is speeding. I checked the engine controller which was in pristine condition, but to make sure everything is all right I changed the condensators to the recomended ones. It also had a major service yesterday to keep it in shape (oil system flushed, fuel system cleaned, oil changed, filter changed, front wheels balanced...), but this issue is still present. Is anyone had the same before?