When cold it starts well and goes for a few miles. Then the car starts to jerk as if I was pumping the accelerator. It then cuts out. I put it into park and restart the engine again. When I try to drive it a few yards it cuts out again. It keeps doing this until I just leave it for a few hours to cool down and then it will go fine for another while until the same thing happens again. It is quite an old car (1994) with 116,000 miles on the clock. I brought it to the garage and they checked for a vacuum leak, changed the oil and filters and did an emissions test and none of this made any difference. I hope you can help!