The SCV was replaced last year. It always starts very well...almost instantly and idle is also very smooth and quiet. Only varies by about 5-7rpm, by the scan gauge. It just behaves perfectly, except for these very rare events, where on each occasion, it has gone into limp mode with a slight throttle increase from around 80kph as the traffic speed picked up slightly. No doubt it'll get worse eventually, which will make it easier to diagnose, but in the meantime it could be a hazard.

