right my focus has a problem, when you boot it some times it pops and stops runing right and then will clear it self and be fine for a while then re do it, took the car back to fords and they said it was fine and couldnt find any thing wrong could it be the map sensor ? it is worse when going up hill and booting it seems to do it best when high up the rev range any help please as it is pissing me off as you carnt over take with it because you never know when its going to do it