ok, heres what happened,
driving down the road, stop on the lights, take off, 50m and then it dies
its still running but the engine is shaking and its working all out of shape (like when u swap ur spark plug lines so the cylinders rnt in order), ratheling and it sounds like its gonna turn off any sec, turned it off and started again a couple of times, after that it will not turn on again, the starter motor is working because it sounds like its gonna turn on any sec, but it wont

what can it be??
first though was a fuel pump
then the computer

mechanics r not open till couple of days so cant do anything till then
appreciate any help/tips/ideas

its my gf's car which she just bought so not happy Jane