Several times last year when I put the car (manual) into first gear it would not move, I would try again and with effort it would go, I then discovered that by pshifting it into second gear when this happened the car would go. I have asked my Volvo mechanic about this a couple of times but he had no ideas about what it could be. For the last few months it has been fine, but these symptoms have returned twice in the last couple of days. When I do start off in the car I do so gently, doing a fast start can sometimes make the car "buck" slightly in the back end, perhaps these two things are related? The car is well maintained and runs very well apart from the above.