[Bertie A]

I have a similar intermittent problem, at motorway speeds only. No stalling as yet, but the car won't accelerate. Yellow triangle and "engine Service Required" appears. At constant throttle it recovers itself after a minute or two, and switching off momentarily seems also to recover it, but that's not a completely sensible solution. It would therefore seem likely, or at least possible, to be one of the sensors in the engine management system. Has anyone else had this and got to the bottom of it, please?