after about 5 mins of town driving this morning, I got on the motorway (car had already reached normal operating temperature) after about another 5 mins at about 75mph, the car started decelerating, so I changed down, and down again, doing 50 mph in 3rd, and slowing rapidly.
pulled on to hard shoulder, and the car stalled and would not start for longer than about 5 secs before stallings. so I started swearing, then gave it another go, it started first time and went perfectly even to 110mph.
any ideas of what it could've been?
the mixture is slightly rich, and car has done 7,500 miles since last full service at the start of september.