I'm not sure if this is a further symptom of the misfiring issue, but I would be interested to hear views on this. Drove to work this morning and felt that the car was a little low powered. So, parked up - in neutral - and sat for a minute or so and the idle was a bit lumpy, but only slightly noticeable. Anyway, decided to press the accelerator to rev the engine. Even with my foot to the floor, the car refused to rev past 3,000rpm. No matter what I did, the car would not rev past 3,000rpm. Now, I did wonder if this was a way to protect the car from over-revving, but as said earlier, happy for owners to comment.